Many players who say that online poker is a Scam back up their words by the fact that they often got into the so-called "cooler". A cooler is a situation when a player drains the entire stack with good cards in hand. This is usually due to the fact that two or more opponents get fairly strong starting hands that are not willing to fold.
So, for example, if you get your hands on a pair of KK, and your opponent a pair of AA, then you will both be sure of your victory and move all the chips in all-in, such cases are called coolers. Both participants from the point of view of strategy perform the right actions, but the victory is likely to go to your opponent. Moreover, it is noted that such cases are more profitable for the room, because poker players who are confident in their cards are dealing big, inflating the Bank as much as possible, and therefore increasing the rake of the room
