An experience that is super shitty for the user isn't going to result in any users. If you are trying to take users away from twitter, you're going to focus on

An experience that is super shitty for the user isn't going to result in any users. If you are trying to take users away from twitter, you're going to focus on some 'nice for the user' things (or, at least, 'nicer than twitter for the user'). Like most things in life, this isn't a binary choice (user or advertiser). They're going to try to optimize for both, striking a balance.