Nice summary. I've tried GitHub sponsors myself, and so far have one sponsor (which I'm thankful for!) for Open Source contributions that I know is used by hundreds of large companies.
After reading a blog post on that subject yesterday evening, I just wrote an article about the idea of integrating a Sponsorware approach into dev.to:
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.