I only watched the first few minutes, but I'd say that the majority are not going faster than 10mph (I assume the speed was supposed to be 8 knots), or not much. Some of the bigger boats look like commercial trip boats and I doubt if their masters would compromise their licences and insurance by exceeding local regulations.

But there are a few boats which certainly are exceeding that, and some going at planing speed, which creates a bigger wake close by. But they're all too close together, and the little boats are too near the big ones.

Imagine somebody in one of those little motor boats. They probably use it to go out fishing at the weekend, and rarely motor at more than 4 knots. They're being pushed along by the bigger boats - and their enthusiam. There's water coming over from breaking wakes. They'd like to slow down...