More precisely, at one point and for an instant, he wanted to own Twitter. His subsequent behavior could be interpreted as not wanting it at that price, but his actions were to try and stop the sale - not negotiate a different price.
I think Elon has mental health / behavioral issues that drive this, but because he's a billionaire, we don't really care all that much. As long as he doesn't go full Kanye (which is a line he is scarily close to).
Many big companies have retention policies, where all messages are automatically deleted after X months unless specifically persisted / pinned. It's highly unlikely that Twitter has much internal emails from 2019-2020, let alone 2015-2016.
This could be true. The last 3 years had even more fake news though.
Google docs and etc. don't usually have retention policy.
Imagine a bigger problem: an employee comments in a doc about Russian propaganda/fake news, and execs decided not to invest in eliminating them. Now it's borderline national security issues.