They also seem to make it appear as if they are doomed because of the close relationship between twitter and bit.ly. Is twitter the only way URL redirectors can

They also seem to make it appear as if they are doomed because of the close relationship between twitter and bit.ly. Is twitter the only way URL redirectors can grow? Aren't there any others who want to do a one-up on twitter and can potentially use tr.im (facebook??) if they offer challenging reasons? Secondly, if they have no business model, and they do not have any connections, they dont seem to have any options!