If you read most privacy notices, they include accepting the sharing of your personal information ONLY WITH PARTNERS THAT HAVE RELEVANT INTERESTS.
OF course that can include anyone, so by sharing your email address you are also accepting their desire to sell your name, and SELL they do, at very high costs.
With a background in marketing, I have both bought and sold countless names and numbers over the last 15-20 years. Even most ISP's have a sharing disclaimer that APPEARS to be them saying they won't share your name or info, but if you read further it is often the absolute opposite. Most ISP's you sign with have you accept an agreement that gives them permission to openly sell or share your info with their selected partners too.
News feeds are no different, it's just a marketing tool, not free info from wanna be reporters trying to make a name for themselves. Often the company or website they blog for will allow them AirTime because they generate followers and followers are marketing dollars.
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