Do hotels jam up WiFi in the evenings on purpose?

So there's this theory going around that some hotel lines purposefully jam up their WiFi service late evenings to block free porn on the Internet!   Why would they do that?  Well, why let the customer get something for free that a lot of hotel still sell on their pay-per-view TV sets!

It's a theory that holds water to be honest.  Some big chains have great WiFi in the mornings and afternoons but as the evening sets in, the connections seem to not work so well.  Is it because more people are just using the WiFi to e-mail and surf the web?   We'll never know!!!