Sci-Hub has been blocked in India

It becomes harder as many websites block popular VPNs themselves.

Try any US or UK government websites. Or try logging in or ordering something on BestBuy or HomeDepot. Many sites allow ordering but then cancel order next day (e.g. when processing by shop.app).

Instagram allows to open a profile either logged in or without a VPN.

in a slightly different direction: many sites also take it upon themselves to implement ip blocks. for example, us-based utility companies or healthcare companies seem to block IPs from “strategic competitor” countries (let’s say) but also from many others including supposed allies.

And it's a compliance requirement -- you are actually required to block IPs of sanctioned countries and territories.

When I argued that Google Cloud must have been blocking those already, they told me to provide some evidence (a written confirmation from GCP that they block the IPs), which is fair.