Gambling on aggregators and platforms is bad because you are the new kid on the block betting against experts, people with enormous computing power and of course win or lose you have to give a cut to the aggregator or the platform.

Gambling and betting should be 1v1 , as soon as you introduce a pool or an aggregator the wise advice is to stay away if such pool or aggregator has more than say a certain amount of bettors (100k-1M), because you become the new kid on the block and the new kid on the block gets skinned.

Thing is the implication of all the above is that we should stay away from every stock market and that would be quite right considering how it produces such loopsided outcomes, not unlike the gambling platforms or even worse