Civil Liberties

Not only demand that all potentially "harmful" sites require government IDs under penalty of substantial fines, but also require them to blacklist known VPN IP addresses. Sites affected by the UK act include Wikipedia (which sued and lost), Spotify, Reddit and 4chan (UK is trying to fine them).
The UK also forbids website operators from even recommending VPNs.

In addition to the known IP blocks, a really stupid government might compel deep packet inspection or AI-driven analysis to sniff out suspected VPN traffic. Then there's Russia, where VPN use counts as an aggravating factor in criminal access to forbidden sites.

Don't rule out going full authoritarian and block non-compliant sites at the ISP level.