That makes no sense at all. I can't imagine you seriously believe that they are deleting people's purchased files as a way to lock them in to a service.
Adobe doesn't forcibly move a user's files into the cloud and delete the originals.
The fact that you would do this makes sense of why you think Apple would
However, it seems like it would have no effect until a user tried to leave, and make an already unhappy customer even more displeased. How can this be a good business decision?
Do you seriously think that could be part of Apple's strategy?
In any case, you are accusing Apple of using a deliberately deceptive and destructive business practice to retain an insignificant number of users with a massive downside if discovered.
It's both unprecedented and implausible.