How Rollbit got your information? Stake and Rollbit are associated with each other? I am not aware of it? And they credited bonus in your account out of no where, only because you are a high roller or diamond player at stake?
OP believes that Rollbit bought "hacked email list of all stake.com users", that is why Rollbit were able to send the promotion bonus to the OP and other Stake.com users.
this is a thread from stake.com forum where they talk about suddenly getting emails from different gambling site.
I had complicated thoughts understanding what the OP meant by Rollbit.com haven’t somehow discovered him or her as a diamond player on Stake.com. Like, where these guys (gambling sites) into any form of data sharing… well it appears that isn’t the case with you talking about email hacks and data sells but, is that overly possible? How many spam mails has one got to read to single out certain high stake or ranking users on the other parties gambling site.
As unusual as the case may seem, it’s most likely not to be the case as, I don’t see a reputable gambling platform like Rollbit going into such shady act just to acquire and keep gamblers.