Their policies are predatory at the very least. When there is a high network txn load it is highly likely that even txn's with fees will be delayed. Perhaps this is their way of deterring sophisticated double spend attacks, but it hurts the average user way more.
They are thieves no different from the rest of the ponzi scammers out there; and mark my words, don't be surprised when they disappear with everyone's bitcoins one day (or they get "hacked").
Nobody forces you to bet on events that have just closed you know. That's the gist of this debate: somebody decided they have the god given right to bet on a proposition once it was clear which way it'd resolve, and then sucked at even trying to implement this in practice.
The part where they sucked at the implementation is given undue weight, what's important is really the other half: don't be that asshole that looks at a bet for six months and sends a no fee tx once the resolution is imminent.
Take a risk, that's what betting exists to reward.