Uniswap is a wholly decentralised platform, meaning that you won’t need to go through a registration process in order to use the network. There are also minimal fees for buying and selling tokens through the Uniswap network — which are calculated according to the Ethereum ‘gas’ principles.
The code is open-source, and therefore the network can be forked in much the same way as any open-source currency. In fact, it was a fork of the network that prompted the launch of the UNI currency.