For those who don't know, the US requires every foreign visitor to get approved for entry via ESTA, which is basically a visa in every conceivable way except that they don't call it one. It's also essentially identical to ETIAS, the system mentioned in this article.
IMO, ESTA is and has always been always a blatant violation of the Visa Wavier treaty, so it's not unreasonable for Europe to respond in kind.