Pricing is key
The reason so many people downloaded the Sketchbook app, like I did, was because it was 99 cents and the Sketchbook Express version is free. I made the mistake of trying it on a phone where it mostly sucks sewer water through a coffee straw, the tiny double barrel kind, not the boba straw you get from Charbucks. Anyway, it might not be so bad on a tablet but I don't believe there is enough real estate on my phone.
That said, the Sketchbook app isn't cloudy. It's seems like a tiny version of the PC program. It's a bit like saying "hey these mini sliders sell great, we should rent space where folks can go and cut up beef to store in our freezer!" With that kind of thinking, I see a merger with HP in their future.