They can be used as a tool to forecast the future, but you have the choice whether or not to take any specific path.
Let's say if you were to carry on as you are at the time of the reading, or to choose one of the paths as shown in the reading then future events would be interpretable from the card layout. However, you have "Free Will" & at any given time you have the option to make a different choice, which may lead to the less likely outcome.
You are the master of your destiny & therefore you can steer your future in whichever way you desire. Tarot cards can assist you by unfolding one, or multiple outcomes but at the end of the day you make your future through your own decisions, whatever they may turn out to be..?