I figure about 50% of the "Is this still available?" questions are people that looked and accidentally hit the button. I ALWAYS ask a specific question so the seller knows it's not a mistake or a bot.
Yes looking thru ads on Marketplace on my phone I have hit the "Is this still available?" button and never even know it until I get a Direct Message back
BUT if I am interested in something and I send out the "Is this still available?" I expect a response back , because of so many ads that the item has sold and they never took the ad down
And there is no e-mail involved , Its all in a locked down Direct Message system