How can I use someone else's API key from Google Maps?

Question

Google

I am engaged in bounty hunting, many sites have Google maps built in, and there is a vulnerability in the code in the form of an api key that anyone can get.
I do not understand how an attacker can use it for their own purposes.
Upd: there is still a token (xs finally)

Answer 1

The question contains the answer - the Google Maps API key can be used to display maps on your site. What for? Paid accounts have fewer request frequency limits.

Answer 2

the code of the pages can also be obtained by everyone