You are part of The Problem.
This is a solo dev's venture, that has a relatively pure and straightforward goal. If you can't afford it, don't use it and pick one of the others.
Do NOT compare this with a B2C offering that has nothing to do with analytics.
Do NOT compare this with a B2B offering that's free and feeds your user's data into the parent corporation's advertising revenue stream.
Do NOT compare this with a B2B offering that is open-source, with a team of a dozen core contributors that has had a decade of development under its belt.
Plus, I have zero confidence that someone using a naive postgres implementation can scale an analytics backend with customers paying only $12/mo unless all those customers get barely any traffic. Perhaps if he was using Timescale on top of postgres, but even then, $12/mo seems awfully low.
But as it is, the price point signals that he doesn't think it's a particularly valuable service.