They used an AI model to repeatedly generate guesses of the code until it matched the compiled bytecode, then AI-generated new code based on the decompiled source to create a technically unique codebase that can do most of the same functions and looks extremely close to the original.

Has essentially every feature, but also bugs out a lot or has features that technically work, but not in the same way as Photoshop (e.g. magic wand selection tool might bug out and select stuff on more than one layer, and might be less accurate and selecting fine edges)