What "free spins offers" comes down to is simple: spins are worth less than they look. Free spins are the most common casino offer and the hardest to value at a glance. Each spin has a fixed stake set by the casino, often the smallest the game allows, and the winnings may land as cash or as a bonus with wagering. The number of spins in the headline says little until the spin value, the selected games and the terms on winnings are known.
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A cap on free spin winnings limits how much the spins can turn into, however well they land. Anything above the cap is removed when the bonus converts to cash. Caps are common on spins given without a deposit and can be low enough to make a large hit on the selected slot pointless. The figure is part of the offer terms and matters most on volatile games, where the rare big result is the main reason to play.
The value of an offer is the number of spins multiplied by the stake of each spin. A hundred spins at the lowest stake can be worth less than twenty spins at a higher one. Multiplying that total by the return of the selected slot gives the amount the spins are expected to pay back on average, which is usually a small fraction of the headline impression. The stake per spin is stated in the terms, sometimes only as a coin value.
The casino ties spins to one slot or a short list, named in the offer, and that game sets both the return and the volatility.
Often yes, frequently counted on the winnings alone, and even a small requirement can take a long session while the balance runs down.
Larger offers are often split by day, each batch needing a login or fresh opt in, so a missed day can mean a lost batch.
Paying spin winnings as cash with no wagering costs the casino more per spin, so those offers tend to include a smaller number of spins.
Many offers cap spin winnings, especially spins given without a deposit, and anything above the cap is removed when the bonus converts to cash.
Multiply the number of spins by the stake of each spin; a hundred spins at the lowest stake can be worth less than twenty at a higher one.