Solved it! It was a combination of many solutions presented above, but I just had to put them in the right order:
Apr 17, 2020 I've been experiencing frequent full system freezing on MacOS 10.15.4. I took a look at log files and it seems to be File Stream crashing. The report mentions the process 'mountdfsfuse' and 'Abort trap: 6' - has anyone else experienced this?
I deleted the Google Drive File Stream app, emptied the trash
I reinstalled the app (still gave an error when trying to log in)
I went to the Finder folder Library --> Application Support --> Google.
I renamed the folder DriveFS to DriveFS.old
I was now able to log into the app, but it still gave an error accessing the files:
With Google Drive File Stream, the contents of your Google Drive appears on your Mac like a regular drive. Unlike Google Backup & Sync (and the old Google Drive app), the files are not all copied to your computer. This saves a lot of space on your drive and almost eliminates sync errors.File Stream is only available for Google Apps G-Suite users. With Drive File Stream, you stream your Drive files directly from the cloud to your Mac or PC, freeing up disk space and network bandwidth. Because Drive files are stored in the cloud, any changes.
Google Drive File Stream Application
I then went to GO --> Utilities --> Terminal in order to overwrite the Gatekeeper
I entered: sudo spctl --master-disable
Google Drive File Stream App Download
Then I entered my password (it’s not visible that you enter something, but the key strokes are noted)
After this I went to system preferences --> Security & Privacy
Google Drive Stream Download Mac
Under ‘Allow apps downloaded from’ the option ‘Anywhere’ was now visible and automatically enabled
Google Drive File Stream For Mac Download
Also, it now showed the text ‘System software from developer “Google, Inc.” was blocked from loading’. --> click 'Allow'
Google Drive File Stream App Machine
Then when reopening the app, it would start downloading all my files.