How so? Seems like a pretty good way to filter out who is using automation to submit applications spuriously like recruiting headshops, and you know that your application immediately gets to the top of the person's inbox who is directly responsible for the hiring decision. To me, that feels more respectful of the candidate.
It's disrespectful to candidates time to play misdirection games like this. If the form wasn't put up to mislead people, it would be different. There's a reason most places don't do stuff like this. The problem isn't the extra 30 seconds requires to open gmail, the problem is the kind of immature culture it signals.