Some think 2021 killed data models of bitcoin’s price because pretty much every prediction failed. Stock-to-Flow promised $135,000 in December 2021 as a “worst-case scenario” Bob Loukas's Four-Year Cycle missed both the time and price of the cycle peak in 2021. The current halving cycle doesn’t align with previous ones and logarithmic growth charts missed their targets. Data models leave a pretty wide margin for error, says Mark Helfman.