Spotify playlists and Browse are very bias. My Spotify 'home page' shows me mostly popular/mainstream stuff that I never listen to. :)
There's however plenty of automatically generated customized playlists available next to that. When you create a playlist it also recommends tracks it thinks will fit etc... I haven't found any obvious bias in those so far and they often recommend obscure old tracks that I doubt anybody cares to promote anymore.
There's also the Fresh Finds playlists, which work a little differently by surfacing unknown songs that "tastemakers" have been listening to.
Whatever your opinion on "current gatekeepers", some of them do provide valuable filtering services that I struggle to see how an algorithm could accurately replicate without compromising what makes music magical.
Blogs, don't know how they're going to discover stuff if it's all published on Spotify initially.