Designers: What do you do when you find a forum that removed your copyright?

[Gene Steinberg]

Isn't that illegal without permission copyright i mean. Also why make a bot for checking all mybb sites to see if the copyright information on your skin is there?

Illegal yes. As a practical matter, of course, enforcing a claim may be expensive, as is showing a financial loss unless you charge for your intellectual property.

As a starting point, if you have a problem of this sort, and the offender won't restore the copyright, contact that offender's host (if there is one) and see if that helps.