It's that the interview process proposed by the G[...]P may force the candidate to do things that may be illegal to pass the interview. The candidate is of course responsible for their own choices, but the point is that as an interviewer, if you force your candidates to do this, you might short list those who have a tendency to violate contract terms.

This might work out for some, but I'd say it's a fair point to bring up.

I'm an employer right now in my small company. Don't see any reason to screw up my employees, on the contrary, I see it's much better to work in a friendly environment. There's no such "unimportant but necessary to the business" things.

What's your source?

"unimportant but necessary to the business"

What examples?

The win10 laptop is locked down tight, including removable drives disabled, DNS forced through corporate servers, SSH blocked outside network, etc. I wouldn't be surprised if all activity was somehow centrally logged for compliance too.

I had to request permission to whitelist my VPN account to access Github.com. Even with VPN disabled the laptop still uses corporate DNS.

The security policy is designed to prevent theft.

Of course there _are_ ways to circumvent these protections but you'd be in a world of legal trouble if caught.