> E-Book platforms sometimes even directly support sending that mail.
I believe that stopped many years ago: https://goodereader.com/blog/e-book-news/baen-books-can-no-l...
Its not difficult but I think a lot of non-technical users will have trouble with it:
Oh wow. The last few times I used it, it was promotional books, so I didn't realize it stopped being allowed for paid books.
That does suck indeed.