Yes, i lost my money with free spins, and i`m sure that it is the main purpose of such bonuses - make the gambler spend his own money to get the profit from the free spins.
There is no better teacher than self experience. You can not teach someone without you knowing that thing through experience. If you must predict, you must have experience in predicting game or otherwise, so as to be able to predict for others. So therefore, you must have spent your resources to learning how to predict which means it is not free.
Perhaps it is more accurate to say that experience is the best teacher. IMO, someone, can gain knowledge from other people's experiences. yes, in this context, gambling.
speaking of predictions, in fact we can learn from people who have more experience and have extensive knowledge. for example, football observers, we can listen to what they have to say, whether it's related to techniques, formations, players, patterns, systems, anything related to knowledge that can add to our references. one more thing, understand the gambling we like, and gamble with something we know. that's important, and what to watch out for before gambling.
To analyze, predict, not only requires experience, but involves all aspects. That's why it's important for someone to recognize the type of gambling that we like. if not, it's just as useless. the point is, we know what we are doing. because, in combat especially sports, prediction is an art that few people are aware of. to achieve that, we need knowledge, understanding, experience and also insight. then, we combine through analysis and reach a conclusion which we call prediction.