AFAIK in the case of automobiles, it is already required by U.S. law. It is my understanding that they are obligated to make the same materials available to third party mechanics that they do to their own.
One, they have an online parts catalog. Except, where pricing and purchase information are supposed to be listed, they say "Contact Tesla". For everything. Down to the most inane of bolts and nuts.
So you could "Contact Tesla". Who will tell you that you are unable to order any of those parts. Down to the most inane of bolts and nuts.
Or you could go to MA, where they are required to provide servicing information. How does that work?
You call ahead, and make an appointment. You also pay a fee which, the last time I heard, was $295.
When your appointment arrives you show up at the location and are lead into a room. You are not allowed: a cell phone, a camera, or a laptop, any "audio and/or video recording device". Handwritten notes only. And you have a time limit.
That's Tesla's "commitment to corporate transparency" (the same one they quoted when they bailed out of an NTSB investigation), and their "approach to third party repair" in a nutshell.
How else are we going to save the environment if we don't switch to cars that are as disposable as smartphones?
It is, but they can charge some amount for it (not prohibitively though). The biggest problems in R2R generally in the U.S. seem to stem from misuse of the DMCA as a mechanism to prevent modification of physical goods by making those goods rely on what they can argue are copyright protection devices (and thus difficult to legally circumvent).