It must be an algorithm change in the spotify recommendation engine. Either because the top50 playlist overstated the correlation between "liking Drake" and "l

It must be an algorithm change in the spotify recommendation engine. Either because the top50 playlist overstated the correlation between "liking Drake" and "liking Taylor Swift", or because they found that by trying to broaden the spectrum of what people listen to, they get people to listen to more music, and they get less-than-top50 artists happier.