Haha, I don't know if anyone else is trying to break into this sector, but reading HN makes it absolutely nerve wracking. It seems like every day I read a title like this and poop myself a little.
Nothing new here. As I see it, their main advantage over GroupMe is that they don't have to pay Twilio (assuming they're hooked into the Google Voice fun). That's probably hardly an advantage though because they still have to pay the carriers.
I imagine they have something bigger things planned