...
One now defunct online site was offering 7:1 for Trump to win. Some people cleaned up (sadly I wasn't one of them only due to a lack of BTC at the time to place a wager) - which is probably why that site ended up going downhill fairly quickly afterwards.
Seriously if a casino offers that kind of odds
today on a Trump win then I guarantee you
something is wrong with their odds provider, the odds of him winning should not be that high and today it would make more sense if it was around @1.7 or something.
~
I believe there is no "odds provider" responsible for that, in the sense that you imply. After a certain amount of bets have been placed, the odds are formed in accordance with how much money were bet on this or that side. Otherwise sportsbooks would be gambling by themselves, having the option either win or lose. But they don't want to gamble, they just want to earn with their house edge, that's all. If there were 7:1 for Trump to win, that's because 7 times more money were placed on the other side.
Regarding the current Biden/Trump situation, I would bet on Trump because the chances for either of them winning are closer to 50/50, while the outcome odds for Trump are above 2.0 everywhere.