> It makes 0 sense since there's too much volatility plus it's open to manipulation by outsiders.

So what? They don't have to keep it in Bitcoin.

It makes lots of sense as they would safe millions on fees if done right.

> Amazon is perfectly positioned to create its own virtual coin

They could, and there's even a big change they would. We've seen big companies do dumb stuff. e.g. FB Libra project.