The mempool clears with every block although to different fee levels. The fee level "1sat/vB" is kind of arbitrary. Did it clear down to 0sat/vB? Can you proof it did? There is no universal mempool so I doubt you can.
mempools last cleared over six months ago, they may never clear again 👀

bitcoin transaction fees limit network abuse by making usage expensive - there is a cost to every transaction, set by a dynamic free market based on demand - it is an incredibly robust way to prevent spam without relying on centralized entities that can be corrupted or pressured: https://www.discreetlog.com/utxos/
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