I have seen this multiple times in the past, but again this afternoon I just created a new station, and it starts up populated with thumbs up and down already.
Without some extreme work, I can't verify it, but I'm pretty sure that my thumbs up/down are applying globally a lot of the time. Some songs it seems just stopped ever playing, and a lot of times I find a station starts playing something from completely the wrong genre for that station, to see that the song says it's thumbed-up.
Moderator Edit: Edited title for clarity
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