It is definitely not open-source. They created their own license: https://github.com/antiwork/gumroad?tab=License-1-ov-file

And the tl;dr on the “suspicious timing” is that the owner seems to have gotten rid of support staff and replaced them with an AI chatbot so that he can go “work” for DOGE. Yes, really.

Why should anyone care about the gumroad code anyway? The software is the least important part of running a service like that.

I hate that assholes are in charge of everything.

Alternative to gumroad?