Big onions exploit PCDN users' traffic for upload speed tests on all speed testing sites.

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Once you're deemed to be a PCDN user, the upload speed of the website you use for testing is all within the package rate, but when you use Douyin, Kuaishou, and cloud storage services like NetEase to upload, it's limited to below 700kb/s. The upload speed test on the China University of Science and Technology website also shows that it's less than 700kb/s, but the upload speed test results from the Meituan Jiaju platform and the local联通 website are consistent with the package rate. So you can't prove your contract violation by using the broadband upload function because you get no evidence.