[svobud]

I think we don't know the whole story here.

If they asked you not to put a specific link in your sig or their rules state certain links aren't allowed .. and you violated their policy, then what's the problem?

Have you attempted to contact the site admin for their reasoning? Either way, it still comes down to the site being privately owned .. and the owner/admin has every right to allow or not allow their choosing. I'm sure if you start violating site policy here, that you might end up with the same result as before.

Just my opinion - nothing more.