I don't think this is a UDP issue. UDP is just a basic network setting. Perhaps they used other fraud detection techniques.
How to get proxies from tor network or any other?
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There are several tot modules for BAS >
https://community.bablosoft.com/topic/9519/tor
https://community.bablosoft.com/topic/14198/tor-module
https://community.bablosoft.com/topic/10243/advor