“We made them…”
Um, no.
The issue of casinos linking *to* websites in their own network means that affiliates could be sending traffic to a casino site, which then sends it (or the pagerank or the authority) elsewhere. That’s one thing.
A different thing is a casino having its own means of attracting traffic, whether it is print ads and publications, or TV ads and publications, or Internet ads or sites. There is nothing wrong with a casino promoting itself, and in fact, if you don’t understand that this is the obvious future, you better. Casinos compete with portals all the time (since the casino sites obviously rank in search engines themselves). Using other sites besides just the parent is normal, like Winner Online. On the other hand, creating spamming crap (which did not happen here) just means the casino network should be reported, and that you might not want to associate with them.