Incredible pro-user move. I tried to get an early start-up I worked for to do this. Over the years they've spent hundreds of man hours developing a custom editing grid, and it's absolutely one of the scariest/most crazy pieces of the system. And it's no where near as powerful/flexible/well-known/robust for users.

But yeah, the comments below about rate limits & bans? I was probably wrong to try to advocate Sheets, however much technical sense it made, however good a working experience would have been.