It’s perfectly fine to use these forums for general discussions and teams helping teams. That’s what these forums are for.
However, if a post asks, “Is X legal.” that’s no longer teams helping teams. It is asking about a specific rule and we’d prefer that people don’t answer rule questions here, even if they know, or think they know the answer because these forums are not official and nothing anybody says in these forums are official and it’s not a good outcome if someone goes to a competition thinking something is legal because they read it here and it is not.
So that’s why your topic got locked. So that nobody would answer the question here.
Discuss endoscopic cameras all you want. Talk about how cool they’d be to use. Even go so far as to say, “Has anyone asked about their legality over on ftc-qa?” Just don’t ask, “Are they legal?” here for the aforementioned reasons.