If they completely replace a game with its successor and shut the former down, then people can only play the latter: the developers don’t have to compete with themselves, and the publishers have an easier time with their enshittification of their franchise.
The game that kicked off SKG in the first place is an example of this, as far as I’ve heard The Crew was better received than The Crew 2 and 3.
KeepassXC (a PC application) has a preset for Steam OTP parameters, if your Android/iOS app of choice allows you to use non-standard parameters I guess it should be possible to use them?
The only somewhat painful part for me was actually getting the OTP secret.