For me is not even a question of security but a question of sanity. It feels like torture. You are watching something with your brain in that context and suddendly, a commercial about something I am not remotely interested is thrown to my face.

I am simply not that kind of consumer. That's not the way I learn about products I'll buy later. In fact, I've never ever bought something I saw in a youtube commercial. IMHO, the current model of advertisement is broken.