Oh, Memrise community forum software limits comments from new signed-up users?
This is just GREAT!!!
If you want to see a forum discussion software repeatingly fail and to OPEN all doors to spammers and robots for mass commenting in a very short time, you can take a look on the Duolingo discussions.
Even with the introduction to e-mail verification new users (who signed up some hours, 1-7 days, weeks ago) have full access once they pass the level 2 in a language; for the Educators and Troubleshooting forums these can even be accessed on the basic level 1.
I (and many other users) got TONS of e-mails in our inbox to subscribed threads after robots posted to HUNDREDS of threads and there is quite a lot of ABUSE from new users going on.
There even is no spam / abuse report button.
It is IMHO a very good thing to an existing community and to prevent any attacks when NEW user accounts are set - firewall alike - with a thread and comment ratio per second / minute / hour and that you firstly have to progress up in forum ranks that more functionality is unlocked.
I very much welcome any active protection mechanisms like this on the Memrise community forum!