How often do public perceptions and media narratives influence betting odds in ongoing leagues, and how can bettors exploit these discrepancies to find value bets
The casino site are not sitting any Odds according to the bet amount. they doing their own research and then set a odd for every match. If a site sets odds according to customer opinion and customer demand then that site will go bankrupt very quickly. But one thing to note is that equal amount of odds are offered on every site for every match every time. Although I'm not sure, I think there is a specific person or organization that every gambling site follows to set the Odd amount.
Not only research, but they have some data analysis to do the job of calculating those odds. Also, some are already using AI tool to predict such odds. Bookmakers should be ahead in terms of technology, otherwise, they can easily go bankrupt these days if they are not careful with their operations. As you will also noticed, the odds in different bookmakers are similar. So most definitely, they have done such comparison as well.