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 wiss' case the fetching error could be just a bad timing where stake is under maintenance as other users experienced the same error as well. If it is confirmed to be blocked I think he could use the alternative site stake.games.