First, we strongly recommend reading our whitepaper available at this link: https://ammut.network/files/ammut.pdf

Second, to answer your questions, yes, the platform will be decentralized. Regarding your second question, the only devices allowed inside the network to complete the tasks (at least at first) will be the AmCU devices that are currently in development, which are intended to be a low-cost hardware platform, available for everyone to buy and use.