Comment by Retric

We’re talking 2 texts per person, someone is sending a lot and junk isn’t enough to hit those numbers. Also, 2 factor identification is still usage.

Now it might not on top by number of messages even if it’s close, but that’s a different question. If you’re going to pick one and only one service to use then texting makes you reachable by the widest possible audience demonstrating it’s still #1 by adoption.