[ajsnigrutin]

for "normal people", that's a pain, but with enough resources,...

Although. it has edge usecases even for "normal people":

Eg. you suspect your coworker to be catfishing you on eg. discord, you know that he's in your city now, verify, then wait for him to leave for a vacation to somewhere abroad, check again.

[dotancohen]

This is actually pretty smart, and shows that this exploit could be chained with other information to identify a specific individual. This could also be used to e.g. check which world-travelling reporter is communicating with you.

[mmooss]

It's not an edge case. Using multiple sources of information to paint a more complete picture is the norm. That's how marketing profiles work, for example.