> If regulators ever attack the Amazon stack and split up the company

they'd have to have justification for doing so - which i don't see any.

Profits from AWS props up Amazon losses on retail.

Amazon started breaking out operating income separately in 2013, and the rest of the business has made a profit every year since then. The US retail operation now brings in as much profit as AWS, though some of that is offset by losses in their rest-of-the-world retail business.