During my Premium trial, I noticed many "RTProtectionDaem" file system permission deny errors in the Console app when running on Mojave.
I decided to try adding /Library/Application Support/Malwarebytes/MBAM/Engine.bundle/Contents/PlugIns/RTProtectionDaemon.app to Full Disk Access in System Preferences / Security & Privacy:
After that all the Console errors stopped, and I also noticed a reduction in CPU usage for RTProtectionDaemon.
I couldn't find any info regarding this in the user manual or on the forums, so I just thought I'd post it in case it might help anyone else is seeing issues with Premium on Mojave.