SpeedFan can report the speeds of each fan and it can even change their speed based on current temperatures. This lowers noise and improves computer experience. SpeedFan can access the voltages reported by the hardware. This can help to identify odd issues with computers resetting under stress, for example.
So while securables created by the database owner actually are owned by dbo, this is still the user that created them. Also, most objects are probably not created by the database owner itself, so this still does not explain why most securables end up with dbo as owner.
By default, a new object's owner is the security principal identified as the default owner in the access token attached to the creating process. When an object is created, the SID stored in the access token's Owner field is copied to the security descriptor's Owner field.