I used to trust the authors of unlock, adblock, adblock origins. But they all sold out. Why do you think this time it's different?

Gorhill isn't doing it for money, he's doing it because he believes in an internet where "user agent" means something. He engages in numerous ways with the community. You're sort of asking "How can I trust Gorhill?", and I guess my answer is "How can you trust _anyone_?" I trust Gorhill with this task more than I trust Mozilla, Google, Brave, or any extension put out by a company. Whether that level of trust exceeds a particular individual's thershold is a personal choice, naturally. To echo the sentiment above, I trust a person, but not code, and not companies. This approach is certainly not bulletproof, but it's the best I've found.

I can't be sure about that, of course. It works for now and that's all that matters. Someone might fork it if that would happen.