I google "tripadvisor biased flyertalk" and found this thread.

Like the OP, I also just recently experienced a negative review being rejected for posting, twice. In fact, it was published and then subsequently removed with a email citing I did not comply to their review guidelines. Clearly I was being censored.

Maybe tripadvisor is now biased to property owners and seek to protect them especially against long time reviewers like myself. Tripadvisor is also a hotel booking engine at the same time and some hotels advertise on their website so neutrality in this case is questionable.

It's their website so their rules and they call the shots but I am disappointed with their course of action so from now on, I will choose not to contribute to TA any further.