Yeah they give caching boxes to ISPs as far as I can tell, and videos are served from there if they exist in that cache. About 8-10 years ago, they had an issue

Yeah they give caching boxes to ISPs as far as I can tell, and videos are served from there if they exist in that cache. About 8-10 years ago, they had an issue with that and they'd serve you the wrong video because your neighbor had watched something and it was in the cache. Literally title of the video wouldn't match what is playing.