yes, it's irritating isn't it. I've just seen it too. The free-hosting company have sold-out their souls and put on these ads in the place of the Google ads in return for better profitability in order to maintain a free forum hosting service. Yes we can pay to have the ads removed BUT there's already whinges on the admin forum from forums where they DID pay to have the ads removed but they're popping up. It affects other similar forums such as IMOD so it's not just us.
On the admin forum there's numerous complaints about this so, whilst we individually, cannot make action here, enough whinges from people will eventually tip the scales so I would say just ignore the ads for the moment. The biggest whinge is the ads that make distractibg sounds - people don't really have an issue with the necessity for text or general graphic ads otherwise.
My simple advice to everyone : unless you have a particularly feeble mind and want to...don't bother clicking on the ads....