On the main page of the site of any self-respecting bookmaker and customers there is a section describing the rules and conditions of the game.
Usually, 15+ items are described here, most of which are common to all companies. I will highlight the main ones that definitely cannot be interpreted in different ways:
Betting on sports and other events can be done by users who have reached the age of majority and will go through the registration procedure, indicating true information about themselves. The bookmaker reserves the right to verify the accuracy of the data at any time by asking the player to go through verification by sending copies of identity documents.
Bets are accepted exclusively on events that are present in the line of a particular bookmaker.
The coefficients cannot change in the coupon if they have increased or decreased after the rate has been fixed.
After the transaction is fixed, the client cannot make changes or cancel it. Another thing is the bookmaker, who has the right to calculate the bet on return if there is a suspicion of the contractual nature of the sporting event.
Bets are calculated based on the results of sources that are prescribed separately for each sports discipline – usually, these are the official websites of international and national federations.
It is forbidden to use strategies that the bookmaker considers dishonest. These include catch-up, searching for surebets, middles and other aggressive tactics.
Separately, it is worth paying attention to the points with the conditions for receiving and using bonuses. For example, some companies accrue a bonus for the first deposit with mandatory wagering in bets of various types and wager x1 (that is, put down the entire amount of bonus funds), on other sites you will have to wager 3 times with the specified minimum odds, etc.