If the staff are secretly editing and deleting posts without permission and without reason and without leaving fingerprints, then that would indeed be cause for concern; scandalous, even. However I sincerely doubt this is the case and here's why. I myself am a moderator over at JNE Forums and though we run on vBulletin rather than MyBB, the same safeguards regarding post editing and removal are in place. It is simply not feasible to do these things without leaving traces; every moderator action is logged and where applicable the relevant member notified.

So in summary: we have the testimony of the staff backed up with papertrail evidence against the word of one indivdual member with no supporting evidence. Ladies and gentlebeings, place your bets.