On their website they have this information: "Compatible with bitcoin and Ethereum ecosystems." What gives you cause to say that they will accept other altcoins?
For me, this project is different from others, I think after ico will end, they will be on top list and this project will be more successful than others because staff is active, design and etc is excelent. I have small knowledge in ICO and similar things but my prediction is still what I say. Let's wait and see how successful it will become.
Disregard site design as it was not a good basis for predicting a successful ICO. There are lots of ICO who have like that but turned into scam and totally a shit now.
But on the other, just by taking a look at those QTUM future developments and progress that will be handed by them closely, we can see that devs are really active and taking all the things seriously. Just imagined how much they put money just for advertisement.
Also they pay high for advertising and plus their team members are serious people, some of them are from other serious projects.