This is a sad end.
So many companies are showing how to do Open Source right, and make a profit (be they Citus with postgres, GitLab, JetBrains, RedHat, Automattic with Wordpress, etc).
Reddit followed the Wordpress/GitLab model – code is open source, some minor plugins are closed and only available on the hosted solution – for many years, but now stopped that.
This is a sad day. Just like Google killed the open source nature of Android, Reddit killed the open source nature of Reddit. Yes, some tiny minor parts that are used as libraries are still open, but the actual product is not anymore.
On Android I've been happily using F-droid as my primary marketplace. There's lots of high quality apps that are completely open source. But I think some of the more complicated apps end up having maintenance issues. It can be hard for developers to justify spending lots of time fixing bugs and providing support if they're not getting paid.
One option for solving this is to charge for the precompiled version, while freely providing the source. This way users retain source access and the project gets funded. That's what Textual [0] does, which played a big role in convincing me to buy a license.