The last couple selected recommendations I got from Youtube were Tribal Baroque's ‘Gypsy Dance’ and Hermeto Pascoal's ‘Música da Lagoa (Sinfonia do Alto Ribeira)’ — both only five days ago. Just those two justify the years I've spent nurturing my algo.
For better or worse, the recs are the killer feature of Youtube. One has to look through some junk to find the gems, but they are there.
I never bothered with the 'don’t recommend' thing, except maybe when Youtube was stuck for weeks in a bout of Louis Rossmann vids after I watched one or two of them. Instead, I just choose what I actually watch or add to playlists.