Are job applications that require Google Form submissions just harvesting data and writing samples?

I've applied for a few of these now that have been posted here and never heard anything back, not even from applications that promise a receipt of submission or twenty-four hour response either way. Is this something to be leery of? I always use my catch-all email and previously published samples anyway, so I'm not totally concerned - just curious what's going on and what others' experiences have been.