I have no desire to be hand-savvy so please ask whatever questions you have and I will do my best to clarify.
All of us were early employees of BrightRoll [1], an advertising marketplace that handled 10 million requests / second at peak. We've scaled large systems in the past and we've built this system with scale in mind.
Believe it or not, most workflows are extremely low volume. That, in part with the design of the system, allows us to offer the generous free tier.
We're planning to introduce paid tiers soon. You can see my comment on the parent thread that addresses some of the general questions around pricing asked by others in the thread.
This was a very early release of the platform and we hoped offering the product for free would encourage experimentation. To a great degree, we've seen that, so we think it was the right choice.
Testing and trying something new requires time and effort, which is limited, especially for companies that would be interested, if pricing/future isn't crystal clear, why make the effort?
ESPECIALLY since this would become a key part of the infrastructure / how my app gets its stuff done. Replacing your service with a competitor or something homebrew would be a major pain, especially when I find myself unexpectedly popular.
there is NO WAY I would ever use or recommend a service that refuses to tell me what my potential long term costs are up front.
It's too much of a gamble with a business or worse, a hobby project that isn't making me any money to compensate for this unexpected "balloon payment".
(I am not affiliated with this vendor, I just deal with software vendors a fair bit.)