How much of a threat is this to Twillio? I suppose Twillio is more for building whole systems, this is just for notifications but it'll be interesting to see how/if they react to this.
Note the _US_ in there. I stopped reading at that point and couldn't care less. Hi Twilio :)
Of course I still need to figure out something to do with Twilio.
However, Amazon has the footprint to get you worldwide delivery. Twilio just arrived in (parts of) the EU, but that's a temporary advantage. Also, there's that 0.75c charge. That's already a 0.25% saving and Amazon have a habit of reducing the price whenever possible.
Twilio et al will likely focus on better service, more features, easier signup and use.