Btw is the whale domain still in use seeing that playable is where we are getting directed to ??
Everything is fine with the domain. I always use whale.io, I'm used to it, and the domain is short, so I can type it in faster. 
Although, as far as I've seen, Whale has a large number of alternative domains, it seems that they all use the same database, so the same account is used everywhere, regardless of which domain you log in to.
It might not be a bad idea to list all original domains under whale.io control in the footer of the site to prevent potential phishing scams. Given that whale.io is a rapidly growing casino, it's probably only a matter of time before it becomes a primary target for impersonators.