I’d recommend Photopea for casual use that’s not miserable to use. It’s in browser only and is basically a photoshop clone with slightly less features, but it’s amazingly close to Photoshop when I need it to be, even with things like using a pen or a really specific option menu.

It does generate it’s revenue via banner ads but I’ve never seen them with my adblock, if I’m needing to quickly whip something up and utilise my Photoshop familiarity, it’s my go to.