The going legit issue is a long ways off and still merely a pipe dream based on what has been publicly said regarding it- I feel like it's absurd to even act like that is a present day thing to pitchfork about. Licensing is not a small issue considering it's long and short a country by country problem- and of course all the illegal scanslations would have to leave as no sane JP publisher would extend licensing rights to a venue that is also hosting pirated reproductions of other parts of their catalog. And that's not even accounting for how married the largest publishers are to the likes of Viz and Yen Press- Dex is not poaching any of Shueisa's cash cows out from under Viz for example. Thus I find it incredibly hypocritical for some of these groups to act like they have some moral high ground when their 'business model' is to steal from Weekly Shounen Jump, a legally English licensed publication by Viz that has a cheap subscription and offers a large back catalog. Dex becoming a legitimate publisher has a million other issues, like quality control, that are not so easily addressed too- groups that publish through them would in theory become paid contractors to Dex, whose reputation takes all the hits for product failure. I don't mean to be throwing shade and singling groups out but it's the most immediate example that comes to my mind: "Mairimashita! Iruma-kun", what Wicked House releases for that would be laughed out of a professional industry were that to be published as an official release as is. As much shit as I give Yen Press for their goofs, they're not as bad as the pile of releases on Dex (in a general sense, no longer specifically picking on Wicked House, thank you for being my punching bag for a moment) that read like they were run through Babelfish and proofreaders and typsetters said "good enough"- even NISA's Ys 8 launch script reads better.
What I am seeing thus far is a few groups with giant egos but incredibly thin skin. Based on what I read here and recent events, this appears to be largely stemming from the Dex staff refusing to be a nanny for these groups when they're getting criticized by the users or by other groups, especially considering how much OP harps on that and thanks the haters for 'opening their eyes'. And the most recent brouhaha appeared to heavily involve a side that openly disclosed they were doing it for the salt, so way to let the terrorists win guys. I get it, this is a hobby people do for free for the benefit of others; real life comes first and releases get delayed and ungrateful leechers will get pissy...but that's all they are, ungrateful leechers. Same goes for asshats who want to give others shit for asking for donations, fuck em, why does what they think matter so much to you? It's the fucking internet, it's a cesspool of entitled, toxic assholes, grow the fuck up and act like a god damn adult, don't unironically become part of that and insist you're better somehow. Dex's stance is they are merely a platform and do not want to get involved in bickering between groups or between groups and their readers- I don't see a problem with this line in the sand as I do not believe a manga aggregator should be an administratively enforced hugbox, they can have that on their own sites and Discord channels. I'm not saying I think it should be a lawless wasteland, but I expect groups run by grown ass adults to act like them and not cry about haters while insisting dealing with them is everyone else's responsibility. Should Dex be a more clear on the "be civil rules" and more consistent with enforcement of it? Yeah, I think that would be good, as would a way for a group to report the more belligerent assholes for more flagrant behavior (of course that requires a more decisive definition on what that exactly is). But I just don't think even that should be some sort of bubble to insulate everyone from mean things being said at them.
Regarding the donation thing, I understand wanting those to offset hosting costs, and material costs for raws. Sure, I really do get that and don't have a problem with it in of itself, I'm not morally opposed to groups politely asking their fans to chip in and help subsidize the cost of a product they are enjoying. But there comes a point where if you won't and/or can't do your hobby unless others pays for it, it stopped being a hobby and is now a job. And if that's the case, then such groups should put their big boy pants on and treat it like one- which would include legally acquiring licenses to produce and digitally distribute the work (and I say that knowing we all get that's not a thing you can just casually do). It would be like somebody need Patreon support in order to keep building 4K miniatures, or better example: full time live streamers, that's now their job and donations are no longer generous gratuities, it's just their ordinary gross income- the internet era street performer.
But what do I know? I'm just a reader- why care what any of us have to say since apparently our two cents are invalid and we're just dick sucking sheeple if we don't side with the signatories...or we're giant babies and greedy shills if we side with some point they make on some principle...I feel like it's lose-lose chiming in at all right now.