I had similar experiences, and a polite but surprising exchange with Reality that showed we're of very different opinions regarding his editing of posts. I no longer participate there.
I disagree that it's about "following clearly posted rules" - it's about capricious, subjective and surprisingly frequent decisions regarding what is and isn't "on topic" for a given thread. I had several - in my very reasonable opinion - on-topic, polite and useful posts edited or deleted with no explanation or warning. I also had an affiliate shopping program link added to a mention of an item in one of my posts, apparently to generate revenue for the site, but without my permission and (to anyone other than the forum managers) appearing as if I had put it in there. He did remove that one, at least, when I pointed it out.
Too bad, because it's a fine group overall, and there is occasionally unique information there. I wish him the best, acknowledge it's his group to run as he sees fit, but will not participate.