Yeah one major reason RSS has died is because content makers moved away from it as it bypassed their own sites advert serving, particularly if anything more than titles are shared. Reddit will go the same way. Also many content sites have moved to tricks to track and monetise users landing on their pages with share to facebook, facebook like, share to twitter etc buttons (which also passively track people just by a user loading a page with them on). Those all help feed the big tracking systems that social media companies like Facebook use to monetise users data by spying on them, profiling them and selling or using information for marketing; so RSS feeds also deminish that income source.

Google has done it's part in this - it killed Google Reader which was a popular RSS reader. It wasn't a huge product but looking back it makes sense to kill it when it also wants to track people across the internet and also concerns it may have to pay content providers for their content.