Hello, it would be good if, in an ad, when using the Google Maps plugin, the map would not be loaded instantly until it is clicked, but rather a preloaded image of the location, to reduce queries to the API.

Considering it's free product and not much popular nowadays, not sure if it make sense.
But yes you are right. Even better could be to use Images only instead of map (not sure what are pricing and quotes on image only).
For most people it's sufficient.

I understand that this is sufficient for most people, but doing so on a large classifieds site would significantly reduce the number of requests. Something like this:
https://plugins2.abprofitrade.eu/vehicles/cars/bmw-q7-2019_i791#itemMap

Openstreetmaps is much more popular and has also free api.