Look, I own a copy of Aldus PageMaker 3.0.
It's mine, I bought it. There was no subscription.
It was state-of-the-art for desktop publishing back in 1990. It doesn't work anymore! Computers and operating systems get upgraded. Documents created with it are no longer compatible with other software. In effect, I have "lost" my data, by not keeping my program current.
My point is that ownership of the program does not guarantee your ability to access your data. Nobody has to maliciously block you out of your program for it to become completely useless.
The important thing is to know that our program is going to remain vital and functional for the life of our practice, at a reasonable price.