From the
Macrumors FAQs:
Why do I see a certain ad at MacRumors?
MacRumors uses an advertising service that supplies ads from a pool. We do not select the specific ads shown or the specific advertisers who participate. Sometimes you will see an ad that doesn't seem suitable for an Apple-related discussion site, such as an ad for Windows-only software. If so, don't worry about it. Ads support the site, and allow us to provide news and discussion forums free to members and site visitors.
If you find a particular ad especially annoying (e.g., an ad that is oversized or has sound), let us know by posting a screenshot of it in our Site and Forum Feedback forum. If you can also tell us the URL it links to, that can help. Using this information, we can ask to have it removed from the ad pool.