Because you bought a closed-source device by which you surrendered your privacy to whatever the source-controlling company wants.
Dunno if these apps do that or not, but I can easily imagine that using them is a Hobson's Choice even in OSS utopia: take the horse offered (app with tracking) or don't have a horse.
You can sit there and stew over the gall of those people to do it, but if you piss them off enough, it will happen.
To the extent that you can't (network effects or legal obligations or whatever) you still won't be able to if the code of those apps is made available under any license of your choice.