Real-money or Play-money markets: which will be more accurate through the end of 2021 on Futuur?

Futuur offers markets in both play-money (Ooms) and real-money (different cryptocurrencies). Which type of market will have had the highest accuracy rate by the end of 2021?

The result will be determined by the average Brier Score of all resolved markets where both play-money and real-money markets were wagered by forecasters between January 1st and December 31st, 2021. The more accurate type of market will be the one with the lowest Brier Score in that comparison.