It is not allowed in the forum if you mean about multiple post in a row then I don't think there's an explanation that a forum member doing that will get banned or negative trust but only said not allowed.
It's duplicate posting on other boards to be exact. Yes, users will not get banned just by doing this but warnings will be given to the account, and it will not be tolerated.
I am very sure that moderators do not ban users based on account sales. So, in that aspect, he is free. The only punishment he should receive is the one he is suffering currently i.e red tag.
Yes, but accounts can be nuked when spams are too much and redundant in a certain point.
In terms of spamming, should I say that the moderators do not consider him a spammer or his type of spam isn't detrimental to the forum. Maybe if he shares link with suspected malware, he would be banned immediately.
Spam posts doesn't only falls on that kind of posting, it is subjected based on mods as what they already been mentioned.
At the very least expected scenario, the user was scammed due to his eagerness to have sales on those accounts.