Amtrak Censoring Atheists?

I took Amtrak from Toronto to New York and back this week. Thankfully, there was some spotty wi-fi coverage offered by the railroad, but there were significant limits. You could not download any file larger than 10 Megs, which put a stop to my plan to listen to some podcasts. But even more surprisingly, I discovered that some atheist videos were not allowed... such as this one.

I checked some other youtube videos of similar size, but these were not blocked (despite what it says here), and furthermore, the error message I got was different from when I tried to download a podcast that was too big. It suggested I should contact Amtrak by e-mail if I thought something was blocked unfairly, so I did that. They promised a response within 24 hours but, not surprisingly, it's been 24 hours and I've received no explanation.

So, what's going on, Amtrak?