This is a registrar that, if you use their DNS service, refuses to return not found records and instead serves up ads, on your domain. That's cheesy thing to do. I had started to move some domains to them from GoDaddy, found out about it, contacted them to see if they can remove it, and was told off.
Injury to insult: their TOS in no uncertain terms makes you, the website owner, liable for all content they forcibly redirect to. They're at the bottom of the barrel with GoDaddy. Total scumbags.