You might be able to get marginal improvement for overhangs by adjusting support z contact distance, if I’m understanding your problem correctly. I’m usually fiddling a bit with mine, too close and supports are hard to remove. Too far and mine looks close to this.
From the related post linked by op, it’s described as just a portion of the managed instance hosting fee going back to the project devs. So if you pay them to host a lemmy instance, a small cut goes to Lemmy devs. Doesn’t seem sketchy at all. Seems to have nothing to do with monetizing the instance itself, which could be funded by voluntary donations as normal or you could probably do membership fees as some instances do. It seems this is just about giving funding to the software devs. Hopefully this encourages other managed hosting providers to also give a cut of their revenue to the software they are using for their business.