They are now https://au.finance.yahoo.com/news/google-to-sell-tpu-chips-t...

It’s a competitive advantage which allows them to deliver lower cost per inference. If quality continues to asymptote, best value becomes most interesting to consumers.

Then again, if they can provide competition to Nvidia, it may force Nvidia to lower prices across the board.

Because it has been historically strongly coupled to the Google infra, both hardware and software. Now the situation has improved and now they are selling this to external clients, though it is still in a limited fashion.

They are finally starting to. Oracle just announced a week or so ago that they're going to be introducing TPUs to their cloud next year for customers to use.

https://www.msn.com/en-us/technology/tech-companies/oracle-e...

Interesting times ahead with a number of chip makers now vying for this market. TPUs are a mature chip now which gives some strong advantage. At the same time as the TPU announcement, they also mentioned they'll be deploying Cerebras systems as well.

They do. In particular they sold to Anthropic.