My intention is not to be a free host though - that's not sustainable. I hope to fund it through donations and potentially a subscription for enhanced features.
Sites like catbox[.]moe are popular and most months seem to fail to cover all their expenses with donations. And that's using cheap hosting (ovh, hetzner, etc, and no CDN), I imagine that your Fastly bill will be higher than theirs.
For this to work, I think you need to find revenue sources right away and run it as cheaply as possible, otherwise you'll run into problems, creating more link rot in the process.
For this to work, I think you need to find revenue sources right away and run it as cheaply as possible, otherwise you'll run into problems, creating more link rot in the process.
Anyway, I hope you manage to make it work.