So, you can easily export data from any web service and import it into a competing web service? And how exactly would the same code that does that exporting and

So, you can easily export data from any web service and import it into a competing web service? And how exactly would the same code that does that exporting and importing on the server side not work on the client side? Other than that, I think you are mostly confusing cause and effect - none of those are results of technical limitations of "native apps" per se, but rather an effect of the marketing push towards "the cloud". After all, Firefox is a "native app" - as you might have noticed, it's an "expensive small, unmaintained and badly supported thing with very few users".