I wonder how many responses Google Forms scales to, you'd probably move from using Sheets as your frontend to the API to query your responses pretty quickly but

I wonder how many responses Google Forms scales to, you'd probably move from using Sheets as your frontend to the API to query your responses pretty quickly but I wonder if you can get a million responses there without someone shutting you down. That'd give you security and scale, at least as long as the data store behind it scales, and a standard data entry and confirmation dialog that some users might even have seen before.