"So far, Portugal, Norway, Denmark, Finland, Ireland, Germany, France and the U.K. have all issued new travel guidance for those wishing to travel to the U.S."
Last I checked, Germany's advice was similar (i.e., not a general warning); and from the article, it doesn't look like Portugal's advice is a Travel Warning either. There's a difference between making information available, and providing warnings.
What changed is that they made the text clearer, that ESTA approval doesn't guarantee entry and decision is made by the border officer and adding a note that wrong information may lead to incarceration.
Those notes weren't "needed" before as that was rare, while theoretically the rules were the same, but seem to be handled stricter now.
It's absolute lunacy that western governments are giving out negative travel advice against the US at all, but I've noticed Newsweek seems to have an agenda on this topic.
https://www.newsweek.com/portugal-issues-travel-warning-us-2...