Recent analysis has revealed common trading patterns between multiple Bitcoin mining pools.

A comprehensive X thread by Bitcoin developer and observer 0xB10C discovered that several popular Bitcoin mining pools are using the same block templates and transaction prioritization methods as Antpool. This disclosure follows previous research that highlighted the concentration of custodians among the same pool. Analysis Reveals Shared Mining Practices Among Top Bitcoins(…)

Source: https://news.bitcoin.com/recent-analytic-shows-common-transaction-patterns-among-several-bitcoin-mining-pools/