The next step I assume is banning VPN use for anyone under 18 in the UK, followed by only allowing academics or certain roles to use them.
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I imagine this would curtail a large proportion of mobile VPN usage.
Blocking desktop VPNs would be a bit more adhoc but it is possible to make it much harder for many people to download VPN clients.
[1] https://www.digitalsilk.com/digital-trends/mobile-vs-desktop...