Been using it since release and never got a VAC on it. Also I don't do 50+ kills per game, I feel like that's how you get reported, then you get a banned. Someone probably recorded dude and sent in a video with multiple rounds of him finding people without it looking like he has great map awareness.
No hack is unbannable, people the ones the cheat system doesn't catch, the players will catch, record, report and post the evidence to get you banned.
Hack with cause or just get better at the game.
Love the UAV and never had any issues.