I've also checked a few of my reports earlier and a large number of similarly new accounts do not get nuked. It's quite strange and underwhelming to see them being unpunished and keep up posting spam and gibberish. There's a decent chance some, if not many of the accounts you mentioned to be part of one/two major alt farms. As you can see, all of them are in the hunt of acquiring merit and ranking up; I bet you can guess why and what they're aiming for. The neutral tags don't do much, except to prevent future signature campaign managers from choosing them.