Why the correlation btwn US trsry bond yield and BTCUSD 2020/21

I noticed the treasury bond yields are almost identical to the bitcoin/usd chart for 2020 and 2021 ever since the black swan event in March '20, but not in any other period prior to this cycle. Anyone have any insight into why this is and why this wasn't before?
Bitcoin (Cryptocurrency)BTCBTCUSDChart PatternstreasurybondstreasuryyieldUS10Yus10yr

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