Haha, that’s what I’m going to do. But even if the realize, how are they going to get a hold of me?
Discussion
That’s the neat part… 
It was an accident and completely their fault, but consider returning the money. Muun is goofy, but they have helped tons of people get into Bitcoin and lightning and are generally positive for the space. If too many people rip them off, they will go out of business and take everyones' sats with them. That would be bad for the network and the individuals affected.
I’ll do something even better. I’m going to send them an email explaining what I did (so they can fix this) and offering to send the extracted funds back.