Multigateway, which facilitates the exchange of currencies between nodes on different blockchains, involves groups of servers mediating the exchange.
As such, exchange between buyer and seller is not conducted on a peer-to-peer basis. There is a third party involved (albeit not a traditional monolithic third party, but groups of servers utilising m-of-3 multisig). This third party mediates the transaction, and must be trusted to do so.
The above is what it means to perform a cloud service. Processing occurs at (well, near) the centre of the network, rather than being pushed to the network's edges (i.e. the peers), which is what defines fog computing.
Therefore, Multigateway is a cloud service bus for blockchain-based nodes.
In contrast, the Blocknet's decentralised exchange is being developed on a radically p2p model, making it a fog computing service.
You are selecting
one element of SuperNET -
one of the
gateway mechanisms for coins, fiat, assets etc - and characterising all of SuperNET in terms of this alone. InstantDEX is a near-realtime peer-to-peer exchange service. This is clearly not cloudy.