Fairly sure that anthology that was yanked, was yanked because it was straight up an infomercial and there was a litany of broken TOS clauses. Amazon didn't just pull it because they were being mean. Amazon pulled it because there was some serious shady stuff happening with it (including some things that might have been considered incentivization).
As for the most recent removal, I strongly recommend asking questions and peeling back layers before assuming Amazon removed a book for no reason.
Good advice. The unidentified instance I cited, a book that launched yesterday, seems to be a straight-up novel that's selling briskly but is not in the top 100 in its category. The poster said Amazon had admitted it made an error. But the poster also said that Amazon did not restore any of the pre-orders and that Amazon claimed it couldn't even put the book back on sale. The small publisher had to submit a new file. The book is around 5,000 in the Amazon U.S. store right now, which does not suggest that a ton--or even a modest number--of pre-orders were restored. If I hear more about that book--like a big rank drop that suggests the pre-orders were responsible for tonight's rank--I'll report back.
As for anthologies, I know an author who was so determined to get that USA Today Bestseller status the author cheerfully worked with an evil, litigious person who shall not be named even on this site who clearly manipulated that bestseller anthology event. Made me take a step back from that author. Also from anthologies.
Not to discredit the work that goes into anthologies to get letters, but in my mind they are no better than a degree from a for-profit "university". Get a book there on your own and keep it there for two weeks (even with huge marketing spends) says a lot more to me.
There's a reason the NYT eliminated some considerations. The complete manipulations that were always justified by saying, "but the trads do it too..."
ETA: Not that Amazon doesn't screw up. They do. And sometimes, they honestly can't do something. In this case, I would say they can't just return all the sales because it would be against the law. However, I imagine they could send out a notification to the former pre-order customers that the book has been released.
I still recommend people avoid pre-orders with Amazon or do them short enough that any problems aren't so detrimental they destroy a launch. So... 3 weeks is probably that sweet spot, maybe 4 weeks, but anything more and you risk losing a bunch of sales if anything goes wrong.