I do the same with youtube music - I've trained both spotify and youtube to suggest the kind of music I might like, and sometimes they present things I've never heard of before. Many lockdown discoveries have been made this way...
Always been a bit 'Old Man Shouts at Cloud' about music streaming services, but I got six months of Apple Music free when I bought some Beats Fit headphones so I thought I'd give it a go. The 'This Artist + Similar' autogenerated playlists are surprisingly good, and led down twin rabbit holes of Dark Country (which I didn't even know was A Thing, Johnny Cash notwithstanding, but I really rather like) and Shouty German Metal (aka NDH) which, it turns out, is
absolutely fantastic to work out to.
(I mean, Rammstein has always had a strong showing in my workout playlists, but I've now got a dedicated 150 minute workout playlist full of Eisbrecher, Megaherz, OST+Front, Heldmaschine, Stahlmann and the like… there's about a dozen words of English* in the whole thing, and three of those are "HEAVY FUCKING METAL!")
*I figure I'll probably have learnt German by osmosis before the year's out…