@Jon good idea, I like that suggestion.
Here is the official explinatinon of how the privileges work from the Discourse documentation:
New User Sandbox and the Trust System
If your discussion area is be open to the public, new visitors will arrive that are initially strangers to the community. Discourse has a trust system where users can, over time, earn the trust of the community and gain abilities to assist in governing their community.
Discourse is designed to offer safe defaults for public communities, even with no active moderation.
0 (new) → 1 (basic) → 2 (member) → 3 (regular) → 4 (leader)
All new users start out in a sandbox with restrictions for everyone’s safety. Trust level 0 (new) users cannot …
post more than 2 hyperlinks
post any images or file attachments
send private messages
flag posts or topics
have actual links in the “about me” field of their profile
@name mention more than 2 users in a post
Virtually every action a user can take is rate limited for safety, and especially so for new users. But don’t worry, new users can transition to trust level 1 in about 15 minutes.
These defaults are safe, but they may be too conservative for your site:
If you are pre-vetting all users, or your site is private and you approve all new users manually, you can set everyone’s default trust level to 1.
You can relax individual new user restrictions. Search settings for newuser. Ones commonly adjusted are newuser max images, newuser max replies per topic, newuser max links.