Who Uses IBM Power?

Seems it was also discussed earlier on HackerNews about how POWER9 isn't unreasonably expensive - but couldn't seem to glean who are the real server customers.

https://news.ycombinator.com/item?id=15859307

Don't get me wrong, I love IBM POWER and am currently contributing to the LibreSOC/LibreGPU

https://libre-riscv.org/shakti/m_class/

project, but what is the real market for POWER besides niche military use?

Who are POWER9 server customers for example? Seems a bit more expensive than competing Xeon.