Here's the Guide I used! I had to wing a little bit for my vehicle but it was still really easy https://quigs.blog/how-to-disable-onstar-on-the-chevy-bolt-to-protect-your-privacy/
AquaticHelicopter
It might not be enough. But all of those things you listed take a lot of time and enough people to care about it to get out and do things.
It's definitely not good enough, but it's like if you have a giant puncture wound on you leg and no one else is there to help you. You could stuff it with cloth you tore from your shirt or make a makeshift tourniquet and try your best to not bleed out until better help arrives. OR just be like fuck I'm not cut out to deal with this. I'll just lay here and do nothing.
We do need all of those things! But we don't have them right now so we just have to try and stop the bleeding until we do.
I recently bought a 2021 vehicle that has OnStar. I knew this would be a concern, but luckily there was a guide online to replace the antenna with a dummy antenna that isn't ever able to connect to the network to send data.
So that might be an option! It's still collecting but it's not sending anything back.
I think it throws an internal error if you pull the fuse or cut power to it? I'm not entirely sure. I did it so I could disable it and if I needed to re enable it for any reason it would be really easy.