There are open source library devs out there abandoning projects and complaining about companies or other devs taking advantage of their work without them feeling compensated enough or feeling that the required support isn't worth it the effort.
It's normal for people that develop these stuff to want something in return, it's hard to do, hard to maintain, people act as if they're in their RIGHT to have stuff for free because they find them on internet.
Things cost, just as there's no free education, free healthcare, etc. There's no free thing but the air, someone had to pay for it, someone had to pay for these mods with their time so it could exist.