Photopea is not open source [1], it is a free SaaS. Photopea's Github repository [2] is only for bug tracking apparently.
[1] https://github.com/photopea/photopea/issues/45#issuecomment-...
Re:Wine 3.0 Released
by bitcoinofficial on Saturday January 20, 2018 @04:58AM
(#16192810)
Yeah, my fault. Sorry for that :C
[1] https://www.photopea.com/