Well informed people knew that it wasn’t safe already for quite a while.

Most people did not, most companies did not, most public institutions either did not or could make believed they did not.

That’s changing (as are lots of other things) because Trump is being far more loud about how Europe is an adversary of America than previous administrations.

There was quite a lot of fighting against treating America as a safe haven for the data of Europeans from people in the know in Tech and IT Security in Europe but we lost, but now crooked politicians can’t make believe America or American companies are safe for the data of Europeans anymore.