It’s common to block an IP if the majority of traffic from that IP is not the kind of traffic you want.

Why do you need a VPN to access it? If you’re protecting privacy, VPNs don’t block browser-based tracking, only obfuscate where you’re connecting from or preventing man in the middle type attacks from your ISP, but usually that can be better avoided simply by using secure DNS technology. Only other thing is hiding what sites you’re connecting to from your ISP. If you can’t change ISPs, that can be worked around by setting up a trusted, cheap VPS or something as your VPN exit point so you have your own IP address.