It's not mandatory, but it happens to lots of VPN locations.
They are silently blocking (forcing you to log in) as much as they can.
The end goal is to suppress anonymous access to videos, and collect all browsing habits of users.
Gab did this with their jewish payment processor and partner Gabpay. They completely blocked access to VPNs/Tor/Proxies (unless you give them shekels through GabPro, which will expose your real identity).
Good luck with that. I won’t be consuming.