A player facing a small bet, who has a mountain of small chips, silently puts in an oversize chip. The value of the chip is sufficient for a raise. But we're not mind readers, we can't know a raise was intended despite how obvious it was. Therefore, the oversize chip rule.
Similarly, a player who attempts to raise in a situation where a raise is not allowed? Again, we're not supposed to be mind readers. We don't know his reasons. Folding should still be an option. And as I said in the other thread, he should be allowed to attempt the raise so the other players know his intention, should he make the call.
Why would he fold? Any number of reasons.
I'm reminded of a cash game story. Several players in early position who were friends and acting like jerks, all min-raised. A guy in late position attempted to put in a big raise but he was denied because the jerks min-bets capped the action.
Some people would say he wanted to be in the pot, so he should call. Was that his intention? Or was he trying to thin the field? Maybe he had aces and didn't want to go to the flop five handed.