I haven't seen any. Maybe you have a virus.
Commercials
Try going to Tactic Trainer. Each new board I get comes with a commercial. I don't see them using other features. Let me know if you get ads.
That shouldn't be. I did some problems half an hour ago and there weren't any ads. Now when they use a video streaming service for live programming then the service slips some in. I threw a couple of ad blockers on to take care of that. If your problem persists, then maybe you should file a ticket with support and enclose a screenshot or two. Don't forget to tell them what platform you're on.
https://support.chess.com/customer/portal/emails/new
If you need help, please contact our Help and Support team.
Why are we now getting commercials? Chess.com is a fee based service and there shouldn't be ads constantly popping up.
Greg