What if someone looks up an internal domain which is actually publicly exposed. Granted they shouldn’t be secret, doesn’t mean you should broadcast them publicly.
Chrome don’t actively publish nslookups on public sites.
I think you’ve missed the point.
Leaking internal hostnames could allow an attacker to build a view of an internal network ahead of time, before actual penetration. Once inside a network it's often a race against time, so this can make a difference.