An official at Red Trolley came up to me, from behind, unannounced, and yanked on my helmet cam about as hard as he could. Think of a black lab trying to get a chew toy away from you. I almost wrenched my neck and the camera ended up a bit sideways (5-10 deg). I was thinking that the least he could have done is say, "Dude, I'm checking your camera" or something.
Having said that, around here, in CT area, it's less vigorous. Basically if it can fall off you should take it off, but zip ties are somewhat permanent. My bottles are the loosest things on the bike. Any time they want me to remove something off my bike, everyone's bottles will have to go first. I don't want to wipe out because someone dropped a bottle. Higher chance of that then me dropping my cam or SRM or whatever.