Tebow seems confused about everything so it's possible he got a warning and didn't understand.
I've been warned before about what specifically was getting me in hot water. which I appreciated.
I've also been temp banned by some over zealous mod who just did it because he didn't understand what I was saying. It was pure BS and really frustrating that I couldnt respond and say "that's not what I said at all...etc" I know when I step over a line and in that case, I did not step over the line. But that's another story. Thankfully it was only temporary.
I think an ability to question a permaban and present your side of things would be useful but from what I understand, permanent bans are discussed and not just knee jerk reactions. They are serious business.
Possible too, I'd have to ask him (he is on my friends list... *shudder*).
I've been banned once and silenced three times. The first silence was for posting a rather tasteless erotic picture of animated equines. It was a joke, and it was completely censored, but a female mod came across it and didn't find it as funny as others might have. She "warned me" publicly in the thread that if I continued posting anything like that I'd be silenced or banned, yet silenced me at the same time. I thought the warning was odd considering I was silenced anyways, but it was dumb on my part and the silence was fair enough.
The second time I was silenced came about when a certain mod (not going to name any names, it's not a pleasant subject) made a habit of "nuking" a thread when he deemed things were too off-topic. His actions repeatedly frustrated everyone in the thread, because instead of removing the off-topic posts, he would lazily delete multiple pages, including helpful posts, reviews, ongoing on-topic conversations, etc. Myself and another user were bold enough to call him out for it and were vocal in our frustration. He didn't like that, deleted all of our posts as we posted them, left posts of his, literally doctored the discussion, and then silenced both of us (no warning). It was an utter abuse of power simply because he didn't like what certain people had to say. At that time I made a temporary account, just for the purpose of PMing another mod that was involved and asking what happened (I made this clear that I only made the account to message him, not to circumvent the silencing). I was immediately IP banned without warning, and it wasn't until over a week later that Cheapy finally got back to me and unbanned my account.
The other silencing was probably the most confusing, and was a wide silencing of a few regulars. It was the same disgruntled mod as in the situation above. There was no reason behind it, no warning, no explanation, and I believe I contacted Cheapy and he lifted the ban.
So basically, it probably depends on which moderator you get. The first time I was silenced I did at least get a reason behind the silence, as well as a time frame of how long it would last (one week). None of the other occasions came with any of that.
The entire system is unchecked, haphazard, and doesn't even follow its own rules. Granted you CAN appeal a ban by contacting Cheapy, but considering that Cheapy's view towards Tebow was summed up by saying "Look at the guy's posts." I doubt Tebow's coming back.