I would hope that Fiverr is not a representative example of a typical employment process. I understand you have to show that you're not a laggard when it comes to communication, but being dismissed for not replying to a message in 5-10 minutes is insane.

I'm associated with big contractor-providing company and it's clearly communicated that response should be given within 4 hours of receiving.

It never got to the paper but they have way more people to connect than the sample.