I can download a google spreadsheet to CSV also. I agree that you are faster to setup to upload a csv

For some reason you can't upload directly on a google sheets website but you can do the following workflow:

1. Open google drive and drag it to there

2. Open the file on google drive and select spreadsheets.

I like your faceted queries and the JSON format might be appealing. Also Google sheets has an API. https://developers.google.com/sheets/api/

Is my information that I upload public to anyone or private?