And also those early Spotify days where Spotify would automatically post what you’re listening to to your Facebook wall.
I’ve always seen that practice of using the user as your recommendation lever without their consent as unethical.
My suspicion is that it violates the users copyright on their commit message.
Those services always asked ahead of time though. And at the time, it was seen as cool, like a not-so-subtle "look at me, listening to music on this cool service".