A: Hi Romain!

It is not just connector.
There are a lot custom functions that speed up you in Google Sheets.

There is implemented complex actually functions for replacing your 1 and 2 dimentional response function into text, to dont allow re-execute the queries again. Also it allows to use other Google Sheets functions to process the results.

+ A lot web scraping functions to fetch content and tags from web

"Do we have to pay for each Query " - it depends on your ai model vendor.