This is one of those things that's going to be stuck in my head for a while. It's like the author gave me a hammer and now im going to go hunting for a nail.
It seems you can write to them as well... This seems much more magical than "Here is a link to a CSV, import the data yourself".
You are in for a whole lot of magical bad ideas :)
Also Google Sheets are "vulnerable" to CSV injection [1] too for "here is a link to an evil CSV, import the data yourself" scenario.
Honestly if there was a way to Auth (even basic Auth or Bearer) via classic Google Sheets, you could create a monster so easily.
It seems you can write to them as well... This seems much more magical than "Here is a link to a CSV, import the data yourself".