Board Thread:Script Suggestions/@comment-25274107-20160928040228/@comment-1757994-20160930015813

TOU says:  You will not: ... (ii) interfere or attempt to interfere with the proper working of the Site or any activities conducted on the Site; Preventing new users from entering chat just because they're new qualifies as interfering with the activities conducted on the site.

You're really also not "allowed" to kick users just because they're new, but Wikia has no way to catch you at it.