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I've been seeing this today too. Same redirect but T-mobile. First I thought my phone had some malware app and was hijacking my browser, so I checked my apps, ran scans, reset my browser and nothing. The redirects still happened. Then it appeared again on another browser. Then it appeared on my other phone. Note neither browser had ad blockers.
I think 4chan has allowed a malicious advertiser to do this shit on the site. Using an adblocker seems to have stopped it.