Interesting paper about residential mobile proxies: xianghang.me/files/ndss21_m
Same authors also published an excellent paper about residential proxies last year (non mobile proxies): ieeexplore.ieee.org/stamp/stamp.js
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In case you can't access the 2nd paper on ieee website, the title is: "Resident Evil: Understanding Residential IP Proxy as a Dark Service". I'm sure you can easily find it on SciHub
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