I really don't see any chances for Trump anymore unless some sort of miracle saves him. Biden still leads in Arizona and has a decent lead in Nevada while he is close to taking Georgia and Pennsylvania.
Even if Biden somehow loses Arizona, he can still take Nevada and Georgia or Pennsylvania and secure the required 270 seats. Also, Trump will just delay the inevitable by going to the Supreme Court since we all know that these things rarely help.
The whole world will probably welcome a new POTUS in the upcoming days which is good news in my opinion.
Obviously unless something major changes we will see Biden win for sure, but that doesn't mean that sportsbooks will start to pay up right away but knowing that you won is a big part of the deal. I mean sportsbooks could just come up and say "unofficial results say Biden so if you wagered on Biden we will eventually pay you, just wait until official results and get your profits" and that alone is enough for gamblers to feel at ease.
Biden already has places he needs to reach 270 anyway, plus he is getting closer in places like GA and PA as well which is why I do not think there is any chance Trump will get from here, for that to happen Trump has to keep PA and GA and NC with him, but also gain one of either Arizona or Nevada which is not going to happen if you ask me.