I'm surprised no eBook Reader vendor has a Project Gutenberg "Store." Where you can just browse Gutenberg, find a book, and just grab it down to the reader. Instead, they either are actively hostile (Kindle), or require the use of Calibre (which itself is good, it is just the friction).
If you don’t strip the Project Gutenberg license from the book text (leaving only the book text, which no-one disputes is public domain and freely distributable), you are required to give “pay a royalty fee of 20% of the gross profits you derive from the use of Project Gutenberg-tm works calculated using the method you already use to calculate your applicable taxes”
https://www.gutenberg.org/policy/license.html
[Way back in the early days of the iPhone, I sold a book reading app which was backed directly by Project Gutenberg texts, called “Eucalyptus”. I sent 20% of the gross profits to PG - which was never less than very supportive of the app - and felt good about doing so.]
Most of them offer their own paid storefronts and have a perverse incentive not to offer a large area full of free books.
Used to be one could sort of get that with the Project Librivox:
e-book app Gutebooks (in addition to their audio app), but it seems to have been deprecated (I'm no longer able to connect to the server on my copy (which I only got 'cause there was an in-app purchase to fund Project Librivox).
FWIW, Barnes & Noble has been plundering the public domain using a book composition/keying house in the Philippines to make their public domain books which they make available in their stores --- Amazon apparently has a similar setup for the Kindle Store:
https://www.amazon.com/Public-Domain-Books-Kindle-Store/s?k=...
Rather a shame that PG didn't monetize by putting their books up there pre-emptively.
I've heard that the newest Kobo e-readers have a browser that you could use to go to gutenberg.org and directly download files.
but yes, generally I agree with your point. Library of 75k books seems pretty valuable to have direct access to.
You can download books directly from the Project Gutenberg website using the web browser on most eBook readers - even the Kindle supports it.
No money for them.
I've used https://standardebooks.org/ to pull nicely formatted Project Gutenberg books on any e-reader that supports a browser (in my case, Boox).
Technically, I can also just directly pull the epub from Project Gutenberg, but sometimes the formatting leaves a lot to be desired.
Once you get an e-reader that runs a semi-capable OS (ex - stock android, even an older version), it's hard to go back to something like a kindle.