They say that the leadership behind Manjaro does not line up with the actual developers and community involved in it, noting that Manjaro has become “one individual’s personal project, and everything is centralized around this single individual”
So just leave to one of the other existing Arch spin offs?
I don't like age verification either but that feature is optional and it's up to the OS distributor to use it or not. Picking a distribution that doesn't use it is easier than building your own distribution with a systemd fork.