Those are not mining pools, those are cloud mining. Cloud mining services are generally scams and you should avoid them like the plague. If there were actually profit to be made off of mining with their hardware, why would someone then proceed to rent out their hardware to others instead of mining for themselves?
I have the same question. If those devices can really make profit, it's logical that the device owners want rent out them instead using them.
But I had heard that a cloud mining service (I forgot its name) does operate such a business legitimately. I don't understand that.