Yes -- this is why it seems risky to invest in Twilio long-term.

Sure, they have the developers today, but if WhatsApp leaves, and Amazon can cross-sell more of their existing customers what they'd otherwise get from Twilio, that's a big problem long-term. Twilio has a bit of a moat with their carrier/provider relationships, but that won't hold up against Amazon's entry.

Time will tell, I guess. The stock has been going crazy the past few days, though