blackjack bonus terms say no strategy play like what does that even mean

Reading the terms on some blackjack promos lately and they keep saying “no strategy play” or “no strategic betting patterns” allowed if you want to clear the bonus. What does that actually mean in practice? Like, is just hitting and standing normally considered strategy? Or are they talking about card counting, betting systems like Martingale, or something else? It’s worded so vaguely it’s impossible to tell what would get you in trouble or forfeit your bonus.

I mostly stick to basic strategy because it feels less risky than just winging it, and the results don’t spike all over the place. The last thing I want is to get a nice win, only for support to say “sorry you used strategy” and take it away. Has anyone had this actually happen to them? What exactly were you doing that got flagged? I’m curious if they ever really check, or if it’s just there to scare us off.