Don’t really get the purpose for this apart from throw away projects.
For vibe coders is it really “hours” setting up a database these days? GCP cloud sql + drizzle ORM is minutes and actually scales unlike a spreadsheet, heck Claude can even write you a deployment script and run it over GCP CLI.
Don't do this guy, cloudsql costs a lot.
I think it can be useful if you want to use an existing Google Sheet, or if your users want to modify the database directly in Google Sheets, even though it seems pretty risky.
SQLite is enough for 98% of all of these use cases, and 100% of the ones this would appeal to
Cloud SQL costs gazillions, sheet is free (other than selling your data)