Ordering book from English author in English language from b

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Ordering book from English author in English language from bookdepository, what could possibly go wrong?
I open the package and the exterior of the book reminds me of a notebook. I open the book, the font is four times smaller than the standard book font size. The Penguin edition of the book has 500 pages, and mine has 100.
I check the publisher - no publisher. Nothing written except the story. I open the bookdepository product page, it says the name of the publisher is "Createspace". I google it, it turns out to be some clickbait self-publishing service.
"I google self-publishing" - publishing of your own book. How can there be then a book by Jack London self-published?
I picked that product because it was the cheapest (actually 14 cents cheaper than the Penguin edition). I've bought books from bookdepository around 20 times and always the cheapest ones, and they were normal books - I mean, they're just books, not fucking weed.

Can you explain me what is this self-publising thing, and how can someone self-publish the work of someone else?

https://www.bookdepository.com/Martin-Eden-Jack-London/9781497536104