[watwut]

That is because most pages worked exactly this way for years - every update was shared on facebook too. It was comfortable for sites for a while - people were likely to hit like on facebook and got you in the feed they visit daily for unrelated reasons. They are less likely to give you e-mail or start with rss feed they don't use.

The alternative is not rss. The alternative is news aggregator few months down the line when sites stop asking people to like them.