BTC December futures reach $73,500 — Is everyone flipping ultra bullish?

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Bitcoin (BTC) has been struggling to break the $60,000 resistance for almost a month. But despite the impasse, BTC futures markets have never been so bullish. While regular spot exchanges are trading near $59,600, the BTC contracts maturing in June are trading above $65,000.
Futures contracts tend to trade at a premium, mainly on neutral-to-bullish markets, and this happens on every asset, including commodities, equities, indexes, and currencies. However, a 50% annualized premium (basis) for contracts expiring in three months is highly uncommon.
The above chart shows that even during the 250% rally between March and June 2019, the futures' basis held below 25%. It was only recently in February 2021 that such phenomena reemerged. Bitcoin surged by 135% in 60 days before the 3-month futures premium surpassed the 25% annualized level on Feb. 8, 2021. Source