So if you were in charge of the government, how would you propose regulating these companies? By forcing them to act as a "utility" that has to list every kind

So if you were in charge of the government, how would you propose regulating these companies? By forcing them to act as a "utility" that has to list every kind of product? Do I disagree with the Dr. Seuss delisting? Yes. Do I think government regulations would be more harmful than helpful in this case? Yes. If eBay was a monopoly, I'd be much more concerned (all the more reason for robust anti-trust legislation). But in practice, if you want to sell a Dr. Seuss book, take your business elsewhere.