With so many decent non-subscription alternatives on the market now, I assume Adobe is staying alive due to their entrenched user base that's into their whole ecosystem and for whom it would be too expensive to switch. Hmmm ... maybe Adobe is modeling itself after Apple....
Apple doesn't charge monthly subscription fees to use their software... unless you're talking about their newer everything as a service business model, but apart from Apple Arcade, I think Apple is just copying their competitors, not being the first to try subscription fees.
And I get all those subscription fees - there's constantly new content available. It's charging subscription fees for software that receives new features infrequently that doesn't make any sense.