Automotive software is a regulated space, there's no way the idea of these APIs is developers tinkering with their Tesla for fun (it allows remote execution!) but rather large businesses integrating their apps with Tesla, like Microsoft or OpenAI or something.
Someone could start a business to enable such tinkering. However, that doesn’t seem like a profitable business to be in at all. Potential downsides seem huge, and potential upside seems tiny.
There's some FOSS called TeslaMate that piggy backs on credentials you can steal from your Tesla app. It monitors and records all manner of statistics for whatever purpose you choose. It can also integrate with Home Assistant and all of the wonderful things it can do. The Tesla app shows a tiny amount of information in comparison and none of it is actionable by automations I write.
That's an annoying amount of work if you just want to access your own car