my theory - could be wrong:
in ye olden days of printed books, publishers paid humans to read them and point out errors BEFORE book went to final print.
so there was a trade called "Proofreader " & you could get paid - probably badly - for doing it.
That seems to have gone. I can be quite forgiving of new/self-published authors ( except for those who would fail a basic grammar exam-
they poured over the text, looking for mistakes before uploading to there web sight ) but there's no excuse for it in high priced books by famous authors ( especially when other famous authors, with different publishers, achieve a far higher standard.
as an example ,I've read a lot of Frederick Forsyths e-books - I don't ever recall an annoying typo in those.
it not just the typos, its books with 57 flavours of indents/ margin settings each with its own CSS, because it's a sloppy scan, so a page or two of dialogue looks like it was set by a drunken typesetter.
So it we would be good to have a way to name & shame the worst offenders. & to list the funniest examples
I have on 2 occasions "returned" books to amazon because the layout was so bad, but I'm not aware that any new-improved versions have been produced since.