In general, I guess winners will choose bitcoin.
When they want to play again , they can easily buy some MBL via bitcoin.
For now, I don't know how to convert directly MBL to Bitcoin on Match Billion.
I believe most people will take bitcoin as their payout check but there must be some conversion to make it balance between eth and btc payout. The problem is if the mbl is not yet on the market, how exactly are they going to pay us if someone wins? There is no based that we can convert our mbl to btc or eth as well. They should consider this to make sure their site is paying