You know it's actually a really good point that I never thought much about.   I've used a few gambling sites over the years and honestly I simply believe my data is already out there and I don't care too much.   But you're right when ownership changes hands it may be a tremendous problem.
 I recall when one of the poker sites I used were acquired by some bigger firm and I just kept using it without even thinking about what would happen to all my personal stuff.   They have my ID documents money data address and even my playing patterns which is very sensitive stuff when you think about it.
 It's kinda alarming since gaming corporations already operate in this odd zone where regulations vary so much per country.   A new owner could definitely have different beliefs or be under financial pressure to monetize user data in ways the original company wouldn't have.
 What makes it worse is we never truly get a choice in these instances.   They basically send some message about changed terms that nobody reads and we keep playing.   By the time you realize there might be an issue your data is already in their hands.