— Does this option get locked in once it’s selected? If not, are user-specific entries messed up if the option is turned off/on after the app is already in development?
No, it’s not locked in, you can switch back and forth. Real and anonymous email addresses can coexist in the same app. If you turn this feature on or off, the email addresses in your spreadsheet won’t change - real email addresses will remain real and anonymous ones anonymous. User-specific data is bound to the row ID, which also doesn’t change, so it’ll keep working.
— Are end users given any indication that this option is selected by the developer, or is it up to the developer to add something in the app to indicate this?
No, there’s no indication to app users.
— if this is used, what happens when an Action Text component is added that sends email to a user? Is it affected at all?
This won’t work for the time being, since we don’t forward emails to anonymous email addresses. We will add that feature later.