The tape over my webcam has been a lifesaver when joining a business conference call using software with aggressive "everyone should be sharing their webcam" defaults.
A (male) coworker ended up sharing his webcam on a call with important clients -- while shirtless, in bed. I've had some close calls myself, and have seen some funny slip-ups.
Regardless, even against hacking scenarios, the tape costs nothing and blocks out some ugly "what if" scenarios from consideration. So it just seems like the reasonable thing to do.
BlueJeans perhaps? Holy moly i ended up disconnecting my camera just to get it to shut up.