"Forget about whistle-blowing in Europe, it will likely blow up in your face."
In most European countries, in fact not any that I am aware of, will you get a reward for blowing the whistle. If you do, best case, you don't get any legal problems. Don't expect anyone to hire you in the future. Nobody blew the whistle with the "VW/Audi emissions scandal". They would have gotten a big reward in the US. In the trial the big boss claimed as long that he had nothing to do with it, that it was the sole decision of his engineers, until the court offered him a probation sentence. You blow the whistle? Expect that your boss will claim that it was only your responsibility and he knew nothing about it. Emails on the company server? Expect them to be gone.
"Best thing is, if you are in a company with unethical behavior, to pack your stuff and leave ASAP and hope that you don't get anything of the fallout."
When I was a young engineer in a terrible place, the big boss told me to do something. Disregarding all good practices, risking the health of the employees with this action etc. If I had followed his oral command, it would have been at the same time a reason to be fired on the spot. I could have lived with that, but they could have also claimed millions in damages from the circumstances. There were other issues (IP that I developed). I called in sick for two weeks and then submitted my resignation. Best decision ever. I read about this guy many years later in a major newspaper when he screwed another employee totally off. (Do you read hear H.L.?).
Bottom line: If shit hits the fan, people will lie. They will try to throw you under the bus.
I actually emailed my old boss when I saw the newspaper article, put a link to the article and wrote: "I'm glad to hear that you stayed true to your character." He did not reply.
Yes, he got trouble from the Newspaper article, but they guy he screwed over, he screwed over deeply.