does flat betting blackjack make casinos flag bonus wagering faster

So I’ve been running through a few blackjack bonus wagers, just flat betting the minimum like a robot because I can’t stand the swings right now. It feels like the casino knows when someone isn’t mixing up their bets, especially with all the logs they keep. Is it just me being paranoid or do they actually look for that? I usually jump to the slot promos so not totally familiar with how strict they get on table games. My friend got a “manual review” email and now I’m double guessing if I should just sprinkle some random bet sizes, or if that’s overthinking it.

Do casinos really care if you flat bet your way through a bonus or does it blend in with everyone else grinding out the playthrough? Anyone actually get flagged for that style or am I just being anxious for no reason?