[ch0wn]

No "cloud-enabled" app without snarky comments about data sharing. Sigh. I personally like the dictionary sync across devices. Especially because I use SwiftKey for German which always suffers from terrible dictionary coverage. But what stops you from disabling all online features?

[zz1]

The question is: once online feature is disabled, can you really be sure no information about you is shared beyond your back?

Edit

From what I gather they're not open source: I would be happier to see them go FOSS than free.

[Nyubis]

If you have App Ops you can prevent any app from phoning home, or just gathering sensitive data in the first place (although you can't stop a keyboard from storing your keystrokes).

[drdaeman]

That's a valid concern, though. Why should one invest their time in firewalling their phone or reverse engineering app, when cloud sync could be put into a separate package?

[ch0wn]

That's simply a question of demand and resources required. This is certainly not a trivial task that requires engineers building it. If more people would voice these concerns it probably something Swiftkey would consider.