This question at Workplace and its top-voted answers state that using proxies to access filtered web content is extremely risky for individuals and companies, using pretty strong wording.
There are many proxies out there that are honey pots. Access one, and they travel back through your computer into your company's network, then hit it with ransomware
I can hardly see how reading web content through an open proxy subjects the user to these risks. I am assuming that the user takes some precautions, including
- not installing third-party programs for proxy access
- not installing third-party browser extensions for proxy access
- not entering his credentials or otherwise sensitive information in a proxy session
- having updated software to prevent non-zero-day browser exploits
What risks are connected with using a web proxy that are not mitigated by usual web surfing precautions?