I purchased a license for the CS6 suite in 2016, I contacted Adobe (by phone and email) to verify that the license purchased is genuine, I provided them with the serial number and they assured me that my license is genuine. I've had it registered on my adobe account since 2016.
In November 2023 the application I was working on froze and I received a message saying that my serial number had been revoked and inviting me to subscribe to their service.
I contacted Adobe support with the proof of purchase and the copy of the email Adobe had sent me in 2016 assuring me of the authenticity of the purchased license. With all this proof they kept telling me that it was normal for my license to be revoked, I had exchanges with a dozen Adobe support employees to understand why my license is blocked and each one gave me a completely different reason...
Which makes me think they're thieves, all they care about is getting people to subscribe to their products, or at least they stole the money I saved up for months to be able to use their products legally.
In the end, in my personal experience, the only difference between Adobe and the vendors who sell illegal licenses of Photoshop and co is that Adobe is much more expensive. As for the rest, consumers have no guarantee that Adobe won't make their software installation unusable.