- ProtonVPN UAB lists Tesonet's CEO as a director
- ProtonVPN UAB is operated from Tesonet HQ in Vilnius, Lithuania
- ProtonVPN UAB uses previous Tesonet's technical employees
- ProtonVPN uses IP address blocks that belong to Tesonet
- ProtonVPN mobile app is signed by Tesonet
It seems, that ProtonVPN is a free VPN service by a data mining company from Lithuania.