[automa]

I think it is time consuming for people to add table of contents one by one. It would be a lot faster if a bot automatically generated the table of contents.

As well as the random spaces between words, there are so much of them it would be time consuming to delete those spaces.

Editing the spelling errors would be understandable because only humans can do that while the other two I mentioned probably can be automated via programming.

Also I think even PDF books that you download from Google Books and Archive are hard to read because they don't give you table of contents which probably can be easily made with programming instead of having the reader manually put in the table of contents.