In this game House edge is 2% , so according to house adge you will get 1.98$ if you win.
This particular game coin flip has a 4% house edge which means a 1$ bet will result to 1.96$ profit when you win. I’m not a fan of original games but Stake coin flip seems like a lot of active players now because it’s new.
In case of gambling, most casino games win 2x but receive less than that according to house edge. But in case of sportsbet you will get money according to Odd if you win. Always remember that gambling sites will deduct fees from you according to the wagering. And your winning amount will also depend on how much risk you accept on your bet
If the multiplier displays as x2 then you will get x2. The winning percentage is just the one adjusted and not 50% winning chance rate rather reduced by the house edge.