It should be noted that the cumulative annual revenue of these four conglomerate were north of $4B in 2017.

Unfortunately, they own so many smaller publishers, that it's very hard to boycott all of their subsidiaries effectively and without harming the small fish.

But I do share your sentiment; I haven't loaned even one single book from IA emergency library and I still stand with them in support against opportunistic greed of these publishers in this case.