My technics earbuds briefly connecting to my MacBook and my MacBook proceeding to launch an Apple Music sign up screen over whatever I'm working on in the 5 seconds between me turning music off on my phone and putting my earbuds away says otherwise. Apple are assholes too. They're subtler about it than Microsoft but also much, much smugger.
See? Apple wants you to have all of your shit connected to their proprietary spyware.
And they did indeed start going through your files, they say they're only doing it to check for CP, but lots of people who just had pictures of their own kids had false pedo-accusations thrown at them because of an AI that scanned and mis-identified completely legal content as something it wasn't.
That doesn't answer the question, they asked if it's open source. I agree, I don't want to replace one sketchy data-harvesting service with another, I'd be a lot more comfortable giving shutup10 control of my system if it was on github or gitlab.