I don't quite agree with your statement. Each of us uses a different strategy in both sports betting and casinos. Think about it - even playing without a strategy is a strategy that ultimately leads to winning or losing. In general, a professional bettor who sticks to his strategy, in the long run will be more productive than a bettor who bets, as he thinks, without any strategy.
However, not all gamblers only think about profits but there are also gamblers who bet for fun and they only think about their balance so it doesn't run out quickly and can still be used the next day.
In this case the strategy will definitely be carried out in casinos and in sports betting and that is certain, no gambler will just bet without a strategy base.