The point of AI is that it's supposed to be intelligent. Why silo it in an app? Instead of telling it what to automate, shouldn't it sit at the OS level, watch everything you do, and figure out what to automate by itself?
So if you’re going to need the data center to process it, then you run into the same issue Microsoft did when they announced the OS feature where they took screenshots of your desktop all the time for advanced search or whatever. People consider it to be a privacy issue.
Read that again and really ask yourself if you want a private company to have access to all that and the ability to do whatever it wants with your system at the OS level.
If you believe you can do better, then build it! I don't think the tide has changed though.