they can’t. They are not allowed to have a visa exempt anymore. Last time we almost got denied, even my 12 yo who flew to us in Thailand after visiting family back home, because we have to many visa exemption already (2x and 1 extension). Also my oldest is 15 yo so he does need one
it’s delivered by email, but they can ask for additional proof of stay or call you in for interview. If you’re not in the country where you applied they will cancel the process