In my unasked-for opinion, he should absolutely give up on this project, and take a salaried job that'll let him support his family and not have to deal with the entitlement issues and lack of perspective the community evidently has. If half of what's in this post is true, he's shown admirable restraint: I'd have burned it all down the first time someone got pissy about a free thing I gave them.
Maintainers like Denis shouldn't be asking for donations, they should be sponsored the same way Nike sponsors athletes. If you're a burnt out open source maintainer or know someone who is, I'd love to talk to you. My job is to help create awareness about the issue with companies that depend on your package. I reached out to Denis because we all know he deserves better. Appreciate any leads you could additionally share with me.