You're right, I've listed various European tax havens and made a blank statement which is true only for some of those. I don't claim to know intricate details of each of those, but even as an relative outsider these things are not exactly top secret. It was and most probably still is true for Monaco for example.

If you come as an outsider to Suisse, private banks/tax companies will either refer you to their branch in place where this applies to you, or if your net worth is high enough (can't remember exact threshold but it should be in 5 mil CHF ballpark and above), you can literally buy citizenship and you're covered (ideally in Zug/Luzern as one can witness in local property market there but it always depends on the case).