My take on that is from the old forum where spammers would carpet bomb a topic with tons of crap.
It is really not that unusual for forums to limit new posters. I know it sucks at first.
I really don’t know. Maybe someone from hubs will respond. You might consider sending them a message asking about it.
If they don’t do it already they really need to spell this stuff out clearly for new users.
This is an automatic spam prevention method by the system, my apologies. I’ve increased your user level up by one, so you shouldn’t have this problem now.