Security researcher Michael Horowitz, not to be confused with the current United States Inspector General, has been updating a blog post titled “VPNs on iOS are a scam” ever since May 2022. The rather lengthy post goes into detail about data leaks that occur outside of a VPN tunnel on iOS. The issue was first reported way back in 2020 by ProtonVPN.
VPNs

Source: Hot Hardware – That VPN May Be Leaking Your Data On iOS Devices And Apple Has Known For Years