Matic will partner with different projects/services to become underwriter or provide liquidity like Nuo. DApp developers don’t have to worry about it and by default DApp users will get faster exit support. We also opened up contract details if someone wants to use Matic contracts and faster exits directly and don’t want to use Matic’s services: https://github.com/maticnetwork/contracts/blob/master/contracts/root/withdrawManager/ExitNFT.sol
DAI on Matic Network works perfectly on Testnet today. No problem there.
Regarding Dagger, currently it’s free to use.