Email the Cloudflare folks and see what they might have on offer. Might say no, might offer something with reasonable limits. Asking is free. Even if they can’t offer it for free, they might have some comment on how to optimize to keep costs minimal for serving these bits from CDN infra.

None exist, really. You can host static content for free/cheap but streaming data (god forbid video) is probably the most expensive thing you can do on the internet.

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