I occasionally get those type of “You Won!” ads as well, and it is super annoying! Usually it’s in the form of an Amazon gift card or some nonsense. I’ve only noticed it on my iPad but as others have said, it does make the site unusable and has made me not end up replying to threads that I could’ve provided help with only because I got frustrated by being blocked from replying! In my experience apple products are usually way better with not having as much malware as my PCs have been, so I also have assumed it was this site since I’ve NEVER had it happen with any other site I frequent.
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2004 black SR5 V8 4WD with TRD dual exhaust, Thorley headers, AFE dry filter, Sprint Booster, Icon 2.0 rear shocks, OME 895E springs, Fuel wheels with 265/70/17 Wildpeak AT3W tires, more to come...