Maybe matray’s default settings should be to show only system critical announcements like that so people don’t always just get rid of it as soon as they’ve installed manjaro? 
I remember being actually horrified to see all these garbage popup notifications I didn’t want when I installed the other day and doing just that, at least.
Edit: My comment ws moved, but well, my opinion remains the same. The only thing I’d ever actually want to see are branch update announcements since they sometimes include info about things that may break with updates and how to fix them (e.g. they are critical info and a reminder of them is a good thing, the rest is just distractions/unwanted to the average user I would think, at least it is to me. News are cool and all, but if I want to know 'em, I’ll find them when i want to know 'em and not when I’m notified about them.)
There’s also no obvious way to configure it to do just that from the GUI although I did figure out how (Which was to untick literally everything except autostart and set cat based on branch)
This is a nice project though, the option to get these notifications at all without any real hassle of setting it up is handy.