> Even if the mint is full KYC for peg-in and peg-outs, a user could still make Lightning payments anonymously with the help of other users.

Wouldnt the payment recipients also be KYCd? Why would they become gateways and not get banned from the mint? 

 You can't get banned from a mint (if they allow crash transactions without accounts). 

 I mean banned from being able to transact with a mint via lightning