They are showing up on my Android phone and on my win 11 laptop using Google Chrome I think its a ProBoard forum thing. I also noticed that the forum and pages are loading considerably slower with all these adds popping up. I tried to close the add and got a popup saying that I could go Add free for $8.00 a month.
I got news for them I can go "Add free" for Free by not using Preboards forums any more. I'll give it a week or two to see if AZL forum Admins can get rid of them.