holy.. this is a really good question
obviously people will get the money they would have won
nothing will happen, money is gone
dont think betting websites cares. the game happend. you can replay it as another match, but you cant delete it.
probably treated like 2 macthes, you betted on anonymo last time, you won, you can bet again to win
Nothing, bets are still valid. Nothing changes
Bookamakers have different TOS and sometimes when the tournament provider has changed the result, they might change it too. It all depends on the amount of days passed after match finish and books tos