To me, multiplayer video games should be about having fun with friends. Couch co-op, LAN parties, online multiplayer work for different genres and depending where your friends are. I don’t care if they’re older games, newer games, as long as it’s fun and interesting.
I haven’t had this happen personally, but are you allowed to edit your hosts file? I’m assuming those IP addresses are coming from DNS resolution, and if you hardcode those DNS entries to resolve to 127.0.0.1, it’ll stop the ads.
nslookup <ip address>
should give you the domain names, if not there’s DNS logs in Event Viewer that should tell you.