This is a great idea. On YouTube I use the 'Don't recommend channel' button a lot and consequently the algorithm has learned to filter out a lot of the nonsense.
This button doesn’t really work for me. Often I need to click it multiple times before a video dissapears from my recommendations. Same with the ‘Not interested’ button.
I’m guessing YT works with a system that is ‘eventually consistent’, but having to click the button 2-3 times before a video disappears doesn’t seem particularly consistent to me.