@tomie A lot of websites have it, but they are often hidden, either intentionally (because they are meant for API usage) or by incompetence (the webmaster doesn't know what it is but the CMS they use supports it). For example, WordPress sites have it by default, even if the RSS feed isn't linked anywhere on the site. It's always located in /feed (e.g. https://activistpost.com/feed). WordPress still powers the vast majority of blog and news sites so this should work in most cases.

Youtube used to have hidden RSS feeds for channels, allowing you to subscribe to channels without an account or increasing the channels subscriber count, but apparently they are gone. You can still follow RSS feeds for Youtube channels via Invidious, however.

Same goes with Twitter. They used to have hidden RSS feeds, but I don't know if they do anymore, especially after Elon fucked up the API. You can still follow Twitter accounts via RSS using any of the nitter proxies.