A UX portfolio shows the candidate is a thief and the interviewer opens a legal claim against them for viewing confidential information.
The request for UX portfolios are what happens when graphic designers end up in charge of a UX department. In graphics, most things get published in the public domain so it’s completely fine to see a portfolio of their work. But in UX the wireframes contain critical business information regarding ‘How it Works’ and that belongs to the client, forever. It’s what the clients are paying for in UX, revealing it to a third party is a breach of contract which opens an unlimited liability for everyone involved.
The only times UX examples are without risk is if they are student projects that have not been sold to a company. Even websites that are in the public domain are under copyright and showing the concepts and structures open a liability.
Requests to see a portfolio in job adverts are also a legal risk as they appear to encourage people to breach contracts and NDA’s, this then opens a risk to the advertiser.