Companies buy each other. They often have overlapping IP ranges which causes all sorts of headaches all the time.

Users who VPN into their business partners or clients frequently run into overlapping networks too.

That’s why you’re supposed to use these addresses unlike the people in the story who are using addresses that belong to someone else.

What you are actually supposed to use is real unambiguous ip addresses.

This shouldn't be downvoted, it is the correct implementation.

The UK MOD needed a large, private network space, so they registered 25/8. They can make whatever integrations with other networks they might need, and know their private address space shouldn't collide.

And today anyone can do it with ipv6.