I think you aren't aware of the real picture of those signals because if you were aware of their scams than you would never search for those shady groups. The whale signals are basically fake signals and they post those signals on purpose to loot the money of the ones who think that the signal will be profitable for them.

The tactics they use are similar to pump and dump groups. They buy large volume of a coin in low price and wait for a few days and if there is no good pumping activity on that coin than they target their innocent followers by sending them signals to buy that coin at a price range higher than their own purchasing price.

When those members follow the signals and buy the coin at their mentioned price, they start selling that coin at different price ranges higher than their purchase to earn good profits. Their way is mostly shady and the innocent members lose their money in the process and wait for days to recover their losses. And, most of those member rush sell their coins with loss.