> [1] … if your cache mechanisms will protect you from polling some people’s RSS feeds too fast. Maybe you’re better off if they block you.

They do, just use `--etag-save` and `--etag-compare` and curl does proper caching, since 2020: https://daniel.haxx.se/blog/2019/12/06/curl-speaks-etag/

I have dabbled with replacing my RSS reader with something like this, but haven't done it, yet.