@Gauthier
Project Gutenberg etext 1 is The Declaration of Independence of the United States of America, by Thomas Jefferson
it was produced in 1971
That is true, but as I read their history documents, that actually predates the formation of Project Gutenberg.
https://www.gutenberg.org/about/background/50years.html
Move forward in time to 1971, when Michael Hart invented the eBook. Like Gutenberg's printing press, Hart's innovation followed decades of prior work. To name a few, this includes Vannevar Bush's "Memex" (1930s, based on microfiche), Bob Brown's "The Readies" (1930s), Brown University's "FRESS" (1960s), Ted Nelson's Xanadu (1960s), and many others.
What Michael envisioned in 1971 was eBooks for reading enjoyment. This was the innovation. His focus was not on the mechanics of presentation or analysis, nor was it on outcomes like literary analysis or hermeneutics. The eBook as Michael envisioned it would have a similar purpose to the printed book: enjoyable to read, and a source of enlightenment, education, and entertainment. It would all be free, for unlimited reuse and without limitation of purpose.
For the two decades from 1971-1991, Hart evangelized the idea of eBooks, and worked on the first 100 or so titles. These included historical documents - famously starting with the US Declaration of Independence. Also reference works, literary works, a few donated contemporary works, mathematical constants, and more. Subsequent years saw issuance of short videos and longer movies, graphical collections, sheet music, audio files, and eBooks in dozens of languages and formats.
Like the movable type printing press, the modern digital computer was a machine usable for many different purposes: all types of content, suitable for a wide range of interests. This inspired the vision and genius of Michael Hart.
Project Gutenberg evolved from a concept to become an organization. Volunteers would identity printed books to digitize, and create an eBook for Project Gutenberg to publish and redistribute.
The way I read this, the Project Gutenberg organization (and its web site) were created sometime between 1991 and 2000.