I think muun is a non costodian, but..
Discussion
it is a non custodial wallet, but you have to know that muun gives you the private keys encrypted, so it's virtually impossible to export those private keys to another wallet. You can sweep with their emergency tool kit, but still I would be careful with that wallet, the good thing is ultra simple to use, so it's great.
When i tried phoenix and breeze, isnt it the same problem as well?