The cynical side of me could say, “Look, people are cashing in on stories in the public domain.” Or I could give some of these a shot and see if they’re worth a read. But please don’t let these be in the vein of the Cinder series. (Sorry, those were just too superficial for me.)
Check out these reworked classics and read more at https://www.tor.com/2020/02/05/23-retellings-of-classic-stories-from-science-fiction-fantasy-authors/