An interesting example was Borderlands 2. The game originally had a native port by Aspyr, which worked quite well. 5 years pass and they release a new update and DLC - but they neglected to update the ports. 5 more years pass, then at some point in the past year or two they just plain removed the native Linux packages. They didn't announce it or anything so not 100% sure when. So these days when you install it you always get the (updated) Windows build under proton.

I'm a little sad we lost the native version, but on the other hand running it under proton just works, as I'd been doing for years, and the game would never have been updated otherwise.