That would be great. Just a bit that sends an email from a different innocuous sounding Gmail every month with a generic problem like “app crashes on <random device>” to see if there is a response. If you miss 3 in a row, you’re out

Eh. I’ve been on the receiving end of one of those inboxes and the spam is absolutely, utterly unbearable. Coming up with a better system than a publicly listed email address is on Google at this point, because there is no reasonable way to provide support when you need a spam filter tuned up to such a level that all legitimate mail also ends up in spam.