: It is a common component in OSCP (Offensive Security Certified Professional) labs and notes, often used for setting up "proxychains" to hide the source of network scans.

In practical and educational environments, a proxy-list.txt file is a standard format for:

: Non-encrypted (HTTP) traffic can be intercepted by the proxy owner.

This study by Georgetown University researchers examines the open proxy ecosystem. It measures performance and uncovers previously undisclosed attacks where proxies manipulate user traffic.

: Public proxies often have high latency and short lifespans. Analysis and prediction of web proxies misbehavior - ACM

Published in 2022, this paper focuses on using machine learning to predict which proxies from a given list are likely to engage in "misbehavior," such as injecting ads or malicious scripts into web pages.