1. Is this a product or a feature? Realistically, what's stopping Twilio from providing these features if you prove that there is a market? Or what if someone implements this functionality as an open source gem out of spite? (See: Growl's painful movement away from free)
2. What is your unfair business advantage? And why you instead of someone else? Do you have years of experience working with Twilio or SMS in general? Are you super wealthy or connected politically in an advantageous way? Are any of your employees or founders former Twilio folks?
3. Is there a market here big enough to justify the existence of your company? Even if your CAC is low and your LCV is high, are there more than 1000 people that need this, and are they willing to pay a premium for what you offer?
I'm genuinely curious what kind of customer development you've done to demonstrate that you're solving a hair on fire problem. I'm had no idea there were so many Twilio SMS apps under current or future development.