> offline and fully customizable, but HN/Reddit went mad over it.
...until it isn't.
A self-hosted open-source project you can download and run (or compile yourself and then run) is very different from a closed-source OS-level component that's developed by a for-profit company that makes at least some portion of its revenue on ads.
Twitter was "the public square of the web", until it wasn't. Google Reader was a best-in-class easy RSS reader, until it wasn't.
If you don't have the source code, you don't own or control the software. And when you don't own or control the software, it's reasonable to have more-guarded views on what data you're willing to give to that software.
If that software suddenly appears installed on your machine, constantly recording your screen and running entirely-opaque "AI processing" on it, unless you go through a series of steps to opt out...it's reasonable to be upset, because the opportunity to choose what you're willing to share has been denied to you.
And since it's a closed-source OS component, it's only something you can opt out from....until it isn't.