I guess they don't know who will win, otherwise they just beat on the other sportsbook and stop operating,
No one really know the exact result of a game unless the game is done however in most sportsbook cases they will just confisictate your winning if they are not able to pay you. There has been alot of cases that happened with it which is why people dont really trust a new site and keep on sticking with their favourite site
That s completely a different story that some sites might scam and trusted ones will go longer.
I think sportsbook have no strategy at all, all they believe is just their edge and their system. Some sportsbook want to accept your bet on minimum odds like in directbet if you choose flexible bets then they try to confirm your bet on 1.01 odds lol