The inherent problem with creating a new browser/platform is getting people to create addons/extensions for it.
If you don’t think Google could do this, think again. Google has an iron grip on the Chromium project.
From the beginning of its time with Google, Android was touted as THE open-source phone operating system. The Android Open Source Project was used by several projects to create their own version of Android.
Then at a certain point, Google introduced an app called Google Play Services. This app is not open source and contains all of the stuff you need to access Google’s services.
UXP devs are painful interacting with people but they had already set option to this and the OpenBSD maintainer didn’t care.
The branding is only added using a build flag and not by default and using it you ensure the browser is compiled as desired by the devs in a way they wouldn’t forbid you for distributing I with the branding.
Even if the OpenBSD devs were in the wrong, that sort of attitude ensures I want nothing to do with the Palemoon devs.
And that is not taking into account the redistribution terms.