I just ran across this on eBay: VMware Workstation 14 Pro for Window 1Pc LIFETIME...
I'm guessing that a key generator has been created. I've seen lots of vmware Workstation key generators over the years and it's always bothered me that vmware hasn't taken greater steps to enforce legitimate licensing — but without becoming onerous and requiring activation. Surely vmware can do better. I always bite my thumb a little bit when it's time to buy an upgrade license knowing that many people are running for free.