It's a tweet from user PC_Focus_ that states:
The next Epic Store FREE games has been leaked:
13th game: Ghostrunner
14th game: Escape Academy
15th game: 20 minutes till dawn
16th game: A plague tale innocence
17th game: Marvel's Guardians of the Galaxy
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Here's an article that summarized the claims and counterclaims.
https://www.pcgamer.com/epic-steam-data-reddit/
It sounds like a little of EGS not being as upfront as they should have been and a little bit of running with a misunderstanding by the Internet.
Thank you for the source!
ETA: And given how that all transpired, I can't blame people for being skeptical of capitalists' intentions.