Well, in the most trivial and banal sense possible, it is: there's now another message app that wasn't there before.

I tried to unpack why this phrase is overused. I think it is because it's one of a few things that both sounds lofty when used in a pitch, and wiil always be true.

It's also a great dodge of considering the type of change (changing the world for the better or worse?) or of that change's magnitude (substantially changing the world, or just a little?). To some of a crowd, having heard the above, they will assume things about "changing the world" that may make further probing on those points at a high level sound like duplicate questions, and thus surpresses the chance of getting them. Useful for someone trying to peddle crap.