Postgres has chosen the Portable Operating System Interface (POSIX) abstraction layer as its interface with the operating system. That allows it to run virtually everywhere, and explains why  it works in every cloud, in containers, with all key operating systems and with virtually all hardware platforms. EDB has many customers who have strategically decided to develop against the Postgres API as that allows them to create applications that can be deployed wherever needed.
Unlike other commercial databases that limit some of their features for high availability to their own cloud, there are no such restrictions with Postgres. EDB Postgres delivers the same highly available, always-on Postgres on every platform - not just on some select hardware lines or proprietary clouds.
This extreme portability makes Postgres the ideal platform for hybrid or multi-cloud strategies.