No conspiracy theory needed. There was a fee bidding war for getting into the 840000 block. All txs that didn't make into the 840000 block due to block-size limit didn't just disappear from mempool. So they spill over to further blocks.
It's mostly runes. Block 840,001 had 4.4858 BTC in fees, then 840,004 had 24 BTC in fees.
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