> What do you think I could do? Do you think I should look for a lawyer to deal with it outside the digital world?

Use a trademark.

How will that help? Trademarks do not protect code - only logos, names, brands. And brands are easy to remove.

Something else is needed. If the code is basically open, then there is no technical protection. Remove tens of those repos - hundreds might appear.

Wow, that might actually work, thanks!

First of all, thanks Ivan! Happy user of Photopea.

Second, the trademark will help you against the masqueraders, those copying your tool and the Photopea brandmark. That will help with customers complaining about some other modified product. It will not help in case you find someone copying your codebase and putting it out in the open under a different name. For that, you'll need a copyright.

Doing both of these might be expensive but gives you complete legal standing. Companies will have no choice but to take down the copies.