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When you eagerly claim a massive casino bonus, the required playthrough or wagering requirement is usually heavily advertised.

Because different games have vastly different house edges, the casino assigns a specific "contribution percentage" to each game category.
Slot Machines: The 100% Contribution Standard
Casinos heavily incentivize slot play because these games operate entirely on luck and possess a significantly higher house edge.

Because the mathematical edge favors the house so heavily, the casino is confident they will slowly drain your balance.
The high house edge of slots balances the casino's risk of giving away free moneySome casinos offer bonuses that can only be used on specific slot titlesPlaying a 0% contributing game by mistake will waste your time and bankroll Why Blackjack Barely Contributes
Because these games feature an incredibly low house edge (often under 1%), casinos heavily penalize them regarding bonus contributions.

Many modern online casinos take this a step further and simply reduce the table game contribution rate to absolute zero.
Where to Find the Contribution Table
Before you ever deposit money to claim an offer, you must relentlessly hunt down the casino's specific bonus Terms and Conditions.

Furthermore, if you accidentally play a restricted 0% game with active bonus funds, the casino may confiscate your entire balance.
Game TypeWhy the Rate is Low/ZeroVideo PokerRTP can exceed 99.5% with perfect strategyLive Dealer GamesHigh overhead costs for the casino to operate
If you want to clear a bonus quickly and efficiently, you must temporarily embrace the high volatility of the slot machines.