Actually, I think some Crew have freely shared this information with family, close friends, mostly after their work term has been completed. That is the case of my 3 crew contacts.
I can see it being reasonably discussed on social media since there have been changes to the name-CA, tips, gratuities, and how it was and now is distributed.
I prefer to know who I am giving money to, as it remains a choice for us to pay it or not.