Things are never black & white.
For one, support eventually stops when a platform dies. I can't possibly get any GEOS updates for my Commodore 64 anymore, for instance. Or for this and that DOS application on a 486. That's business, OK.
However, there's also a "grace period" when "spare parts" are supposed to be available even after the products has been discontinued -- I think it's 7 years in EU. So Sygic may have stopped their Maemo updates prematurely. (But then again, I'm no lawyer so I don't know if "software/data updates" can be classified as "spare parts".)