Check your spam box. There's probably one saying "we have control of your camera and we've seen you playing with yourself". There's usually a bitcoin address to send a few hundred bucks to so they don't "send all your contacts the video".

Give it a few days and go look at the address in a Blockchain explorer. There's usually 2 or 3 transactions.

I guess you send 10m emails, you get lucky a handful of times. Spam works enough to make it worth it, especially for what, 7 minutes work?