Based on what happened with Android and Open Source, I'd be wary. Over time some of the Open Source core apps and bits of the O.S. (I think?) were replaced with

Based on what happened with Android and Open Source, I'd be wary. Over time some of the Open Source core apps and bits of the O.S. (I think?) were replaced with closed source things via Google Play. There was good technical motivation for doing so - it bypassed the slow carriers and allowed users to get the latest updates quicker - but the end result was the same. I'm also wary of the feed thing to. As well as the data access thing you mention, how does it decide what the "best" app for a task is and do I get any say? Also, I wonder if it will end up with a situation that if you want your content to be available to these users you have to make it available with no control over how it's presented? (You could argue that on the web currently most content producers have messed that up with trackers, ads, etc which is a fair point but I don't know if this is the answer.) If so, whether it's Open Source or not makes little difference to most people trying to publish stuff.