DoS by local users on local networks? This is that thing where you solve the cryptography problem with the $5 wrench but only slightly different, right?
I haven't looked at the implementation. I was making an off the cuff comment to see if anyone had more information, but yes, ultimately I assume that you could mute an unwanted node with brute force? Or just move further away from it?
I was thinking more you flood the "mail bag" of the "message carrier" and assume the implementation has a LRU eviction policy on said "mail bag".
Someone not participating in briar or the DoS can use fing (android app) or a signal strength meter (handheld, I have 2, personally) to direction find and triangulate the person sending the traffic. Hence $5 lead pipe.
Sounds like an excellent target for DoS