It is another (and overstepping imo) for Ebay to restrict individual people from selling to others goods that are not illegal or in violation of their other practical rules (no selling jewelry, monetary equivalents, etc).
This falls into the category of taste / political opinions and has gone too far too quickly. Much as I don't like what the silly cartoons are, and of course while I don't think Ebay is a public forum that has any obligations (they can do what they want), I think Ebay is getting in deeper than it should.
Will they apply the logic here to all categories of goods for sale? T-shirts? Political buttons? Historical political pamphlets? Current political pamphlets or campaign material? How about baseball team merchandise that has racist mascots? (Why haven’t they?) Merchandise of companies where the CEO may have bigoted views?
How about books that have words in them that discuss race, or in any way describe an unflattering picture of a certain group? Or scientific studies that may come to race-based findings?
I think the other thing that bothers me is that to be protected by such measures, you have to be popular. And it's flimsy. This year it's <x> group, next year that group is forgotten and it's on to <y> group. Woe to the actually wronged group of people who can't garner enough popular support, and who fall by the wayside of laws that are less enforced because people thought the social-media driven justice system took care of it.
Ps. And edit just to add, lest someone discount my opinion as from a privileged position, I am among one of the groups said to be portrayed in a racist way in those books. If only people’s concern about racism in cartoons extended to more important matters as well.