True, except that you need to be able to compile for the latest SDK, etc. Google and Apple now require that your app is compiled against the current or immediately previous SDK, and will actually hide your app on the store if it isn't now. Perfectly good games just disappear from the listings for some BS reason.

And the old version of your game engine often won't compile against newer SDKs, especially if it's more than a couple years old.

I experienced something similar with my game that I made using Unity and the Chromecast plugin for it. Google stopped updating the plugin, and the new Unity didn't work with the old plugin, and for some reason I needed to use a newer Unity version. (It's been a while and my memory is hazy on it now.) I could not compile my game for modern devices anymore. Luckily, it wasn't even a game I had published, so I didn't screw over any users with that, except my own family.