It happened to me!
I left a position at IBM I had held for 10 years in order to fly to the UK to interview with a business partner 8 years ago. I was offered the position, then told a month later all unused sponsorships had been revoked by the newly elected Tory Government (thanks Mrs May!). Thankfully, I was able to acquire a visa through ancestry, and I've been here over 7 years. There are people in the UK who can do what I do, but not that many.