Only Amazon can offer free public domain ebooks on Amazon. Anyone uploading to Amazon's KDP platform has to set a minimum price, and also has to 'add value' to the book in some way.
This is good, in a way, as it has cut down a bit on the numerous editions that added nothing to the Gutenberg text. But it's still a hard task finding the gems among the dross if one if prepared to pay for a bit extra.
If you want more free public domain titles on Amazon (or Kobo, or iBooks), you'll need to talk to the company running the ebook store.
Otherwise, The MobileRead Library and Project Gutenberg are where to go. And then upload the files to your Kindle account.
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