R2 has free egress meaning you don’t pay for bandwidth when serving your popular video

They definitely have sensible backout mechanisms for their free tiers (i.e. Pages, they still serve static assets but disable compute/Functions). Also, their docs are written pretty well, and openly hint at dangerous price traps.

We launched a big presale this year with an e-commerce app hosted on Workers, and we just barely hit the 5$ threshold for the paid plan. Did not use more services (other than DNS/proxy) though, so YMMV.