Your advantage in this case, now or 10 years ago, is that this is simply not true.
If your business is "a flashlight app", yeah, eventually they'll copy it (as it happened). However they'll take an unusual long time to do that simple thing (as it also happened).
Why? Because everything at big companies is a political game, full of internal conflicts, multiple priorities, non-collaborative teams, self-interest, promotion games, and a bunch of other things not really related to build the thing in question. It very rarely has anything to do with how fast the code can be written.
If your business is good enough and becomes something more than "a piece of software", and solves a problem, becomes a brand, has great user feedback... that's not something you can "copy in no time".