[reitzensteinm]

I don't know anything about your architecture, but you can quickly drop in something like BunnyCDN as a caching proxy for about 4% of price of Google egress. Even if it's a Google->Google transfer, since ingress is free, Google->Caching Proxy->Google should be much better.

You could also consider a webhost like Hetzner, on which you can get a bunch of 1 gbps machines very cheap, though you have to manage them yourself.

You could try Cloudflare, but they may well consider it abuse and cut you off (though they like to pretend on HN that they don't do this).

Finally, I know that Google is handing out substantial credits for game developers and this could very well be up their alley.

If you can optimize the download size a bit and swap to a cheaper delivery method, it should become feasible to run on a hobbyist budget.