Most of the time I open youtube in Google container tab, see any interesting video to watch, but I often don't want to have related videos recommended to me. So I watch them in temporary containers.
Because the recommendation is like this, just because I like 3kliksphilip talk about niche ladder mechanic in counter-strike, doesn't mean I'm interested to some random e-sport CS player talk about CS tournaments.
Or one time I watch 2kliksphilip's video on DiRT Rally, I get videos from racing youtubers talk about their driving wheels, and even real-life Rally videos. (Philip doesn't even use driving wheels, he used keyboard, but this is unrelated :3)