alt Hacker NewsYes, but they have their own weaknesses. For instance, Briar exposes your Bluetooth MAC, and there's a bunch of nasty Bluetooth vulns waiting to be exploited. You can't ever perfectly solve for both security and usability, you can only make tradeoffs.
Briar has multiple modes of operation. The Bluetooth mode is not the default mode of operation and is there for circumstances where Internet has been shut down entirely.
For users who configure Briar to connect exclusively over Tor using the normal startup (e.g., for internet-based syncing) and disable Bluetooth, there is no Bluetooth involvement at all, so your Bluetooth MAC address is not exposed.