You cannot hope that consumers are well-behaved on the Internet, it has never been the case unfortunately, you have to act defensively.
If the issue is the processing power because the content served is dynamically generated, cache the content. Even with a server running on ESP32, just a few second should be enough (if the rest of the website to be statically generated)
If the issue is the bandwidth you may focus on big content (i.e. media) and return a 429 or use a CDN just for that (not worth for a feed in my opinion)
If the issue is neither, why bother ? Your time is precious, and you should spend it on more enjoyable things (that is, unless you find doing this enjoyable of course).
If the issue is the processing power because the content served is dynamically generated, cache the content. Even with a server running on ESP32, just a few second should be enough (if the rest of the website to be statically generated)
If the issue is the bandwidth you may focus on big content (i.e. media) and return a 429 or use a CDN just for that (not worth for a feed in my opinion)
If the issue is neither, why bother ? Your time is precious, and you should spend it on more enjoyable things (that is, unless you find doing this enjoyable of course).