have you heard of ISBN numbers?
that's the numbers affixed to any book by the editors, a "requirement" if you ever intend to sell your book commercially, also for eBooks.
In the USA, there is a private company handling those. Thus, registering a ISBN costs you $5 per each if you buy 100 of them. Up to $29.50 if you get the cheapest package of 10. No lower amount. And plenty plenty other "offers" by the nice people of https://www.myidentifiers.com.
Meanwhile, In Canada they are free. Also in the UK. Most of the civilized world has lower "prices" for this necessary service than the US (what else is new?) with fewer attempts to scam you than Bowker and others offer. For example, a favorite such is to buy a bunch, and then resell them by the unit for, say, $49.99.
OK, Mexico requires some complex paperwork initially, but from then on it's like $3 per each, and you don't need to buy more than one at a time, etc.
How "Bowker", whatever that company is, got this deal, and whether they intend to sit on that cow forever is a shame on the ISBN organization.
The whole process is automated, based on very simple scripts, the real cost is at most a few cents, all the rest is taking advantage of the people.
Of course Amazon would not play the game, and they invented their own registry system.