Seven 'no log' VPN providers accused of leaking – yup, you guessed it – 1.2TB of user logs onto the internet • The Register

A string of "zero logging" VPN providers have some explaining to do after more than a terabyte of user logs were found on their servers unprotected and facing the public internet. This data, we are told, included in at least some cases clear-text passwords, personal information, and lists of websites visited, all for anyone to stumble upon.
https://www.theregister.com/2020/07/17/ufo_vpn_database/

Is your VPN secure? - The Conversation US

Virtual private network companies make lots of promising claims about their services. Most people don't have the skills to double-check their providers. So this group of researchers did the testing. ....
https://theconversation.com/is-your-vpn-secure-109130