For example, Roobet
.io is
listed as one of sites to have purchased a non-distributable copy of the previous version of bustabit's source code. I believe they wanted to say roobet.com
Perhaps the .io ccTLD, was owned by Roobet, after all?
If we see
Roobet.com Creative Competition | .15 BTC in prizes! thread, the .io domain is mentioned by a few people.
I tried looking around the site, but couldn't find any information about a domain that is legitimately owned by Roobet.
Based on my observation, currently it seems the other domain that they have is:
https://roobet.gghttps://roobet.ccThose domains including .com are registered using Namecheap.