hide links from innactive members

Hey all, I want my members to have the ability to post anything they want, but I want to avoid the hit and run from people who join only to post a link and leaving forever, by hiding their links if they are inactive on the forum.

I could do that in another forum platform. For example if you don't post 5 times per week then you get demoted in another usergroup were you can't post links. Can something like this be done ?