Feeds can be set up to just show part of the article so you’d still have to visit the site to read it all, which seems a better solution than losing the traffic completely. I’ve deleted many sites that just stopped their RSS at some point and I just kind of forgot about them.

Also, why can’t sponsored texts be added to RSS? It seems to me this would be hard to block by adblockers (and I’ll probably unsubscribe, but still).