So after you "Okay" all of the popups they come back after starting up? Does the same thing happen if you sleep the laptop - as in not shutting it down?
How did you install Mojave - install over High Sierra, fresh install or full download and install over? I did an install over on my 2017 MB Pro and I have not seen anything like that. I did have a lot more permissions request initially but that all settled down.
It might help to do a full download of Mojave and install from the full download if you did an upgrade install.
Did you do what was recommended in your other post about the exact same topic?? Since only a handful of people are reporting this issue, I'm inclined to believe that it is a malware issue as opposed to the real Apple fonts (which is the Fontbook).
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