What exactly has he done wrong?

Okay. Here is the problem. To begin with the age of consent varies from state to state in the US. Some states have the age of consent as low as 14 and others have it at 18... they also have differences in how it is applied with some states having a so called Romeo and Juliet exemption where even if the age of consent was say 17 no statutory rape would occur is the other person was within 3 years of the supposed victims age.

However, the issue here is that the girl was under the age of 18, which means if she was taken to another state or out of the country where she then engaged in sex with someone, it became a federal crime of sex trafficking. Once you take a minor across state lines the state laws on age of consent are tossed aside and the federal laws kick in because you took a minor out of their home state. I don't know where the girl was living at the time she was boinking Andrew. If she lived in the state he boinked her in then you would look at the age of her and the age of consent in that state. But if he boinked her in a different state than where she lived it no longer matters what the age of consent in any state was it become a federal issue and 18 is the age that matters. In fact if she lived in state A where the age was 16 and was taken to state B where the age was 16 it would still be considered sex trafficking because she was still under 18.

Now you also have to understand that he is not being charged with any criminal violation. He is being sued in a civil court so the outcome will never involve prison time only monetary compensation.

Await the lawsuit and find out

But: The prince has categorically denied he has had any form of sexual contact or relationship with Ms Giuffre, formerly known as Virginia Roberts.

So it's she said vs he said. Can she back up her claims?

Also, only Epstein and Maxwell can be charged with trafficing, not Andrew.

He isn't being shunned by his relatives because one 17 year old sex worker came forward, he's being shunned because of all the stuff that wasn't made public. All the shady business deals made with sleazeballs like Epstein and his socially ambitious pals, all the other hookers who might still come forward, all the compromising photos that are in existence. Believe me they've hushed up a lot of shit, and they know damn well there's tons of nightmare fuel out there that may very well come to light some day, other hookers and photos and dirty money, because Andrew made at least four trips to Epstein's island and there isn't anything to do there that isn't shady, and a bazillionaire who owns an island can cover the entire surface area in video cameras.

If this were just one prostitute who was of age in some countries it might be laughed off with a "He's still Randy Andy", but Andrew spent a lot of time with Epstein and who knows where all the carefully collected blackmail info has ended up. No, Andrew is being ditched, because the royal family knows their only defense against future scandal is to declare him disgraced-and-out-of-favor now, which will take most of the force out of the future story about the 14 year old girl or how he became part owner of a slave-labor diamond mine or whatever the next scandal will be.

Whether he did anything illegal or not, his biggest problem was getting involved with Jeffrey Epstein at all. Anyone associated with that monster, whether innocuous or not, now carries his taint, particularly in the opaque way he carried out his "business" dealings with his rich and powerful customers/friends.

Any wrongdoing seems to have been only a legal technicality. He certainly did nothing immoral, since she participated willingly and most certainly knew exactly what she was doing. His only crime was one of stupidity, for becoming involved with Epstein.