No, I am not, but someone explicitly asked you for an alternative. But it's nice to have an alternative ready, otherwise you just sound bitter. Plus, you are not adding to the discussion, the reader is stuck with the same original question - where do you find contract work?
They asked me for an alternative, and I'm giving low value comments by saying I don't have one?
Not all comments need to add to the original discussion. Saying I do not suggest someone uses Upwork and giving my first hand experience of using the platform adds some value to someone.
