Steve Barbour and Rijndael further discuss here:

 Lots of people have demonstrated there is a custody agreement involving Antpool, and possibly F2Pool, for smaller pools (quite a long list).

I'm theorizing Antpool are building blocks for them too (excluding F2Pool), thus controlling all the hashrate for those, by proxy.

Bitmain is also backing / financing a significant % of gross market hashrate (hardware + infra). They are also backing / doing sweetheart deals with lots of software infra.

bitcoin

47% of Bitcoin hashrate uses same custodian

Scoresby

Steve Barbour and Rijndael further discuss here:

https://twitter.com/rot13maxi/status/1778228833168101735

> @checksum0 Lots of people have demonstrated there is a custody agreement involving Antpool, and possibly F2Pool, for smaller pools (quite a long list).
> 
> I'm theorizing Antpool are building blocks for them too (excluding F2Pool), thus controlling all the hashrate for those, by proxy.
> 
> @SGBarbour Yes, I thought this was well known.
> 
> Bitmain is also backing / financing a significant % of gross market hashrate (hardware + infra). They are also backing / doing sweetheart deals with lots of software infra.