That's because a system JRE is the old way of doing things -- and moving away from that wasn't arbitrary; desktops are encouraging app stores, and servers are using containers -- and we want our OpenJDK developers (I'm one of those) to focus on the new way of doing things. Oracle doesn't have control over an ecosystem that could generate billions, like Google with Android or Apple with iOS, so to pay the hundreds of full-time developers who develop OpenJDK, we charge those who want to do things the old way for support. So if you don't want to switch to the new way of doing things, you have a few options:

* Download a JRE with an installer from someone else who builds and distributes it; I don't know about certified distributions, but I think Adopt ships something JRE-like.

* Buy support from Oracle (and help fund OpenJDK's development).

* Build a JRE yourself from the JDK and package it with an installer.

I think that's reasonable.