Post denied. New posts are limited by number of URLs it may ....?

Post denied. New posts are limited by number of URLs it may contain and checked if it doesn’t contain forbidden words.h
why does this occure?

Because every so often, we have spammers come through, create several throw-away forum accounts, and post a lot of garbage text (to slip through the spam filters), including links to their business/purchase sites to drum up business. By denying them the ability to post those URLs, it reduces the desirability of their spamming this site. Unfortunately, it gets in the way of new users as well.

You can post URLs; just put spaces in them, leave off the http[s]://, or something, and we’ll fix them up for you.