ACG on YouTube I feel does a great job at this if he’s following his publicized guidelines. He doesn’t do any sponsored content nor accept paid for trips from the gaming industry and when he receives a free copy of the game for review purposes he purchases a copy to give away to the audience. Accepting the free early copies and paying to give one away on release seems like a good compromise to ensure he can get the review out near the embargo date.
If you want to play modern or even recent games and indulge your locked down metwork desires I recommend getting a secondary PC just for gaming and run a separate vlan to fully separate traffic from your existing setup. There’s really no realistic threat vector there barring a state level actor or something equally serious but I’m happy to be corrected.