You shouldn't really ever believe that a group is for profit because they need to pay for raws, you can get more or less all raws for free if you look. Or you could get someone who's already buying it to provide them, I already provide a couple of groups with volume raws that I rip myself.
There's basically two reasons why you shouldn't pay for scanlations. First is obviously that you're getting ripped off for buying a pirated product. Paying for piracy is a scam. Second is that no money goes to the original creator, and won't let the manga keep going like buying volume raws would. Your money would be far better off supporting the creator and industry and buying the Japanese manga volumes to support them instead of supporting scummy scanlation groups honestly. Another group can easily pick up a manga, but you can't continue a manga that's been cancelled. You could say that supporting for profit scanlation groups is detrimental, because it encourages this scummy behavior.
Sorta yes, but not really, like yes you can find raws out there if you bother searching or know how to rip, which is easy (as lot of these publisher websites that "pay" lock chapters, you can go around easily to get it for free), but more often than not, alot of those "volume" raws are watermarked or the quality is worse than a published chapter (as they tend to compile published chapters to make a fake volume), but at the same time, you can't expect everyone to hand volume raws, magazine raws or paid raws at good quality for free, as some groups or people charge you back more than what they actually cost, is a problem that goes both ways (i used to provide "paid" raws from a couple of these websites for some spanish groups, but after they updated their website i stopped, since is easier to rip now, but i've seen quite a few raw providers charge you back per page)
Of course not going to defend anyone here, but out of these groups that use the coin sytem, at least i can give it to Asmodeus that for the most part only work on series using volume raws or paid only raws, compared to groups like UTOON, that only work using free raws that got shit quality and often censored, and never gonna get better ones, obviously you shouldn't be throwing money on these people ko-fi or patreon garbage, as you should be supporting the author instead, even if you can't read them for shit, this coin system was already a problem with novel translations, now it carried over to manga
