Plausible started in 2019. Not sure when [name redacted] started. Clicking on "blame" for the readme file in the repo, I see a commit from 5 years ago.
I can very much empathize that adding a "buy" button is a hump to get over when you just wanna build something cool and share it with like-minded people. I have the same issue with every project I build. I guess one should train to jump over one's shadow in this regard.