Bitsim is innovation for sure, but services like that are not decentralized. And you probably will let them control your private key as part of their system and let store your information/credentials in Cloud based Services.
Which is not always good idea imo.
From what I understood you are not forced to use their services and will be in control of your keys. So you could control your own wallet with it. But maybe I misunderstood.
Remember that this is about micropayments. It's pretty clear that it's not a good idea to store all your funds on the BitSim system.
ya.ya.yo!