For me I got recommended a video “How to pronounce COCK in British English” - and I didn’t actually watch any learning english related video before and never watched any videos on that channel - It was just so weird how it appeared in my recommended…
trains. I watched a few videos on train hopping in europe (to see what the architecture looked like from a non-tourist view) & now I get recommendations for watching people adjust rails, repair train parts, dvd rips of train enthusiast documentaries, etc. super weird but some are sort of interesting.