It's both for me. It locks on to a few categories or channels and occasionally, almost randomly decides to start showing some other category or channel based en

It's both for me. It locks on to a few categories or channels and occasionally, almost randomly decides to start showing some other category or channel based entirely upon a single view. This is not the same algorithm that they've always used. It began changing somewhere around 3 or 4 years ago and it's completely different now. Honestly, I think they've intentionally broken it. I used to derive a lot of enjoyment from going on an algorithm enhanced "wikiwalk" of YouTube content, discovering many interesting and bizarre videos. It's impossible to do that now, you just wind up stuck on a channel or going around in circles. To put it plainly, I think YouTube has decided to bury all of the fringe and weird one off content in favour of mainstream channels because they can't monetize the former. Good job Google, you killed another golden goose.