What do you mean refusing to give repair information? The entire factory service manual is online and you can pay to use it by subscription for personal use:
Welcome | Tesla Service
I've heard reports of Tesla refusing to sell certain parts, but I'm skeptical that this is most parts. In most states, various right to repair laws prohibit manufactures from making parts unavailable to individuals wishing to repair their own vehicle. In some states, manufacturers must make available specialized diagnostic tools if they are required for such repairs if they are not available through third party sources. If Tesla is really doing this, they are treading on very thin legal ice. I have a hard time believing it.
When MSs start getting out of warranty, if this is really an issue it will become far more public at that point. I hope it's not true.