Steam does the same.
The last I heard, chargebacks no longer result in your Steam account getting banned. You can still play all of the games you already own but you're not permitted to make new purchases for one month. Someone posted a screenshot of the error message a few weeks ago.
edit: Here it is:
http://forums.steampowered.com/forums/showthread.php?t=2524498
See the second image link.