Some of the Microgaming casinos set up accounts for their players with casinos that still accept US players. In this case, US players can use their Vegas Affiliates acct #'s to login at Free Spin Casino. You may have to contact support if your password doesn't work.
I have accts. set up for Grand Hotel, Vegas Slot, Vegas 7, Vegas Country, and Vegas Joker, and I can play each account, all at Free Spin.l
In this case, the free chips have been deposited into each acct. I have for each casino.