[ApK]

I have a lot of thoughts on the philosophy of this, and I haven't even read the actual letter yet.
But I disagree with DD, I think, in one fundamental aspect. Using smart phones as an example:

Google and Apple between them essentially own every fully functional smart phone on the planet, period.

They will limit the options and functionality to what's best for them, what keeps them most powerful, regardless of what even fairly large blocks of consumers want.

If this wasn't so, if there were cottage manufactures where I could reliably buy a smart device with a variety of OSes that had no locks imposed by Google or Apple and didn't depend on them, and which STILL HAD ALL the functionality I need and have come to depend on, like ability to watch Netflix or Disney+, or connect to a secure corporate system, then, I would agree, buyer beware, and shop elsewhere.
But elsewhere doesn't exist.

For computers, the options are still there, but if people don't push back, some quasi-monopoly or Google/Apple type cartel will push the same limitations and eliminate the choice there as well. And then in whatever other domain they can.

So, I'm with the "make a better world" set. Push to keep stuff open.

Oh, and for the "but then people might steal the phone" set: Yes. Freedom isn't safe, and Google's not your mommy.