Because the free services need to be tracked. Not in a bad way. There is a limit of how many person can connect in one free account. Since proton have no data or speed limit for free servers it can easily be abused if they don't make any way to pervert. and if you want to use open vpn protocol you will need an account for users like Linux

The paid version of Proton VPN is one of the best VPNs for security, although it’s also one of the more expensive VPNs we’ve reviewed. Proton VPN Free: Best Free No-Logs VPN. A 100% free VPN with unlimited data and a zero-logs policy that’s been verified in real-world cases. However, it’s bad for streaming and blocks torrenting traffic.

A kill switch is a security feature that protects your IP address in case you unexpectedly lose the connection to a Proton VPN server. In case the connection is interrupted, a kill switch blocks all external network traffic to and from your device until the connection is automatically re-established to the same VPN server.
Proton VPN Stealth is the provider's very own obfuscation technology. A feature becoming common across the industry, it's responsible for making your VPN traffic look like a normal connection

When you enable NetShield Ad-blocker, the DNS server will check these domains against databases of domains known to host malware, ads, or trackers. If any of the domains match, our DNS server will automatically block that resource from loading, keeping your device clean and speeding up your browsing. NetShield Ad-blocker offers three levels of

Yes, other protonvpn staff members that work for customer support. They told me that only US-NY works with Netflix now as it assigns a private IP and my experience reflects that as well. The page you have linked pre-dates the Netflix crackdown. I can tell you that most of the US, the UK, Australia and Switzerland do not have access to the maSO.
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  • does protonvpn have a free version