So does Facebook, and Myspace.
Sometimes we just don't like where a company is going or what it has done to try to actually cough make money. I think with Twitter it's watching what used to be a very open platform slowly, but surely, becoming yet another walled garden.
This is in contrast with other services (like Github, which someone mentioned), whose interests are aligned with yours. They want your experience to be good so that you continue to give them money.
Combine conflict of interest and lack of transparency, and you can explain a lot of problems.