But you have to be logged in. I often pop into an incognito window to watch a video that I don't want YouTube to recommend things related to, which seems to work. YouTube Premium prevents that, right?
I've been consistently exposed to great creators even if they have low viewcounts, and they know which creators I'm subscribed I don't watch at upload time vs which ones I do
I do keep an eye on what do I signal engagement to, so I guess It's not a perfect sample, but still