Earlier quoted context omitted.
It's fully vector but you cannot export to SVG or any other open formats due to the performance difference between Sketchology and other vector apps. (More than 100x even against x86 hardware.) You can export to web[0], which creates a zoomable raster copy of the drawing, but this is obviously limited to getting an editable vector copy. [0] For example: http://www.sketchologyapp.com/u/sketchology/18
Due to the what? It's not up to the application to decide if its data is useful in other applications or not, that's just ... silly lock-in talk. Quite an annoying attitude, if that's representative. Luckily I a) can't draw and b) don't have an iPad so I'm not a lost customer.
Lack of SVG export isn't due to wanting lock in, or even a question of priorities. I spent considerable time working with all the leading vector drawing programs and investigating their performance. The simple fact was that it couldn't work well. Even trivial drawings (20 lines) done with the pencil tool in Sketchology would cause Illustrator to lock up for hours and consume all available memory. Larger drawings would fail to open altogether.
Ultimately I think offering the feature would have been extremely misleading and frustrating for people. I'd rather cut a feature than ship a bad experience.