I noticed that they are no longer available from many countries.
They might be unavailable for various reason. It might be for the restriction from those country. For example many countries does not support gambling so they have restricted those gambling sites to the users of their country. Also, there might have mis match terms and conditions and something else.
^ On this matter, they should include the Term of use or in the FAQ. Recently I opened the site and looking for the restricted countries but I did not find any, from the TOS to the FAQ, or probably I just missed something.
Nevertheless, I just want to clarify this to the OP, is really true that the deposit and withdrawals with Debit / Credit Card & Crypto Currencies are totally free?