It’s just the type of paper filter that was used. The person in the post used a flat-bottom filter when a No°3 or No°4 cone filter would’ve been better. (As an extra aside, the specific type of pour over device seems to be from Starbucks, and those come with No°3 cone filters to begin with.)
Lobbying as well as developmental issues I would assume. I’m no real developer just yet but I’d imagine creating robust security protocols is time-consuming and thinking of every possible vulnerability is not entirely worth it.