I actually think that this might have been fixed. I suspect the main reason 
that bolt was started in the first place was fwupd (the firmware update daemon) 
starting it to force power the thunderbolt controller. It does so even if there 
is no controller to force power in the first place. 
A small fix 
(https://github.com/fwupd/fwupd/commit/7e5c7b269a3b9182db58a201c24835177107ad41)
 to the fwupd daemon should prevent it from poking bolt if there is no hope of 
boltd succeeding in force powering the daemon. Thus on a system without any 
thunderbolt controller boltd should not be started anymore.

NB: The linked bug is to auto idle-quit the daemon if it is started but
no controller found, while the fix should prevent the daemon to even be
started.

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https://bugs.launchpad.net/bugs/1801796

Title:
  boltd running on a system with no thunderbolt devices

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