If you're geeky enough to install a virtual machine and know that will break the restrictions, you're probably mature enough to not need them.

Banning pubs from selling to minors doesn't work, but we should still do it, right?

Physical is different from digital. Sure, today many kids don't know or care about VMs, but they certainly will know and care tomorrow when this regulation hits. And that info will spread like wildfire all over social and blog posts.

About a week after the policy goes live it won't just be the geeks that know, it'll be everyone in the 4th grade.