I even talked about how I didn't even trusted the probably fair part of the third party apps. Now we see even VPN acts different on stake owned games and third party games, in the end I would say that the clear choice would be to stick to games stake so that you would feel at ease with the games and what could happen.
In fact many players love to play those games from 3rd party providers. So saying it was not a good idea is not completely true. I'm sure the main idea of adding those games is to gain more players since Stake knows that there are so many players playing those games out there. It is obviously about preferences, some players prefer to play their original games and some others prefer to play the other games from 3rd party providers.