Photoshop has been around for over 3 decades. It's original patents must have expired by now.
I am also curious how software like Photopea exists. It is a direct Photoshop rip off. But it only runs in your browser. For small jobs it is fantastic since the layout is exactly the same as Photoshop, unfortunately for larger projects it doesn't have the speed that a natively installed app would have. Still check out the website if you need Photoshop functionality without paying Adobe's prices.
But how has Adobe not shut that site down since it mimics Photoshop so closely?
I wish Abode well and would love to see what they come up with.