This is what i don't get. What do these groups have against Mangadex? It's not a website profitting from someone else's work or scraping series and putting watermark on them like other aggregator websites do. Mangadex went down back then, sure, but it's been back for a couple years now. They're not the only group that does this, why the boycott?
I don't remember correctly, and I don't want to use my time figuring it out, but there was an exodus of groups over something like how mangadex handled rights for chapters with multiple credits... Or something just as mundane. I just remember being disappointed at a lack of anything interesting to gawk about.
The fact that mangadex isn't scraping other sites for content, is one of the core reasons that people engage and appreciate this site \ service for. They get a lot of good will for having more scruples than any other site I've been too. No functionally useless for the user marketing scripts from third parties running, for example. (Well, at least in the forums, went to check the main site and Google tag services is there - which I have blocked)