I have a big issue here: this is essentially bootstrapping spreadsheets to do only a singular task for what seems to be free, until it's not.

The competitor to this service would be Monday, which offers a plethora of automation techniques and a straightforward(ish) API to create your own.

There is a huge security concern in giving Gmail write and also Google Drive permissions as well.

Lastly, I would consider this to be something that Gemini can/will accomplish in due time

So what makes this competitive?