Google owns half of the emails in the world which may be more valuable.

Email is not a realtime social network, not even close.

Does Google train AI on emails?

And also Sam Altman doesn't own either OpenAI or Reddit, lol.

My understanding is that Google "owns" reddit in the sense that they paid to use it as source of training data. And goodle paid reddit so much that they have exclusive rights for that.

Probably this is the reason why all the reddit free public APIs are gone - to block scraping.

Can you cite your sources on Altman not owning Reddit?

"large-ish minority shareholder" != owner