How do Polymarket/Kalshi etc percentages work?

For example, they set a new ATH by Dec 31 at 21% yes. How is this even decided? Surely no one can predict crypto enough to set odds for it, it's wayyy too unpredictable and volatile.

submitted by /u/Dull_Caramel_2907 to r/btc
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Quelle: bitcoin-en