Do you mean that bad actors can reverse engineer photoshop and hack its users or that bad actors can whip out plausible photoshop clone with vulnerabilities and backdoors and hack users with that?
Think more broadly than Adobe and any company that relies on a software product could have their business model destroyed overnight. More broadly than that, you could rupture trust between suppliers and vendors if they don't know who's really making requests from a proprietary platform that's been compromised unknowingly.
I'm much more worried about AI made software that is developed so quickly that nobody knows what it does, pdfcraft was published a week ago and it has had 5 releases since then.
Not just api calls but the business logic too.
Laymens thoughts there, but in essence this is my concern. People just looking at any old service in the world and going "hey claude build me a hook into this" and the models are getting close enough to being able to find and decompile the right moving parts on its own.