If Flashbots Protect RPC exists why should dApps integrate the Flashbots Protect API?
By integrating the Flashbots Protect API into your dApp any user will have their transactions submitted to Flashbots regardless of which RPC endpoint they are using. In contrast, the Flashbots Protect RPC requires users to change their RPC endpoint in their wallet to have their transactions submitted to Flashbots.
How is using Flashbots Protect RPC different to using the mistX DEX?
When trading on the mistX.io DEX you benefit from free cancellations and cashback rewards. Using the RPC you can send any type of transaction on any site.
Do you get cashback rewards from using the Flashbots Protect RPC or the Flashbots Protect API?
No you don’t. That is only a feature of the mistX.io DEX and not the Flashbots Protect RPC.