We need to start doing web blocking for non-technical reasons

The problem with these blocks is that they always end up blocking normal users, making the browsing experience worse... the opposite of what the intention was.

I use a forum. The operator decided to block almost every IP range associated with a data center. The problem is that more people are using VPNs due to the spread of geo restrictions, local laws like age verification, etc. And so now I need to disable my VPN - assuming I'm using one - just to access the site.

If there is indeed a lot of people using VPNs then way not to form darknet already? Ask interested site to peer with you. Peer with others, from overlay network, where you and interested parties will be in control. Its the only way imo. We need to build new net from the scratch, using current Internet as transport. VPNs is so easy to use these days, that even no-tech people can use it. All what is need to be done is to provide service by more technical people.