The top two bitcoin mining companies account for 60% of the total market share

Foundry USA, a Bitcoin mining pool based in the United States, and a mining pool under Bitmain, a manufacturer of virtual currency mining equipment.
News 1 reported that Antpool's mining market share has reached 60%.
Three years ago, Foundry USA's market share was 24% and Antpool's was 20%, but now they are both at 30%.
Foundry USA's hash rate is 181EH/s, while Antpool's is 140EH/s, raising concerns about the "centralization of the mining market."
In relation to this, Bob Barnett, founder of the bitcoin mining company Barefoot Mining, said, "Antpool recently mined five of six consecutive blocks.
"They mined the cryptocurrency," he said.