Right, I didn't consider Google. The 360MB/day of free egress traffic (Spark plan) strike me as very peculiar. But at least it isn't Cloudflare's "unlimited" with secret limits in place, or Netlify's 100GB/month and then enormous costs on everything above.

Thanks for reminding me! I'll give Firebase a look.

By the way, very minor thing I noticed. Clicking on your photo on the homepage swaps backgrounds, but the timer-based swapping still runs on its fixed interval. Can look unpolished if you click it a bunch or in the wrong moment.