Each market is different, but when I look at an area like Photoshop or Illustrator, the competition keeps getting better. In some areas they aren’t even competing.
The workflow of a game artist will have them going through a bunch of different products to get to an end result. A lot of those steps can have alternatives. If a vendor has some proprietary format that doesn’t work with anything else they never even get a user base.
If a subscription is funding continuous development, and th company is doing a good job, and I use the software daily it doesn’t bother me. If I use it twice a year, I’m going to be looking hard at alternatives.