It uninstalls Backup & Sync and you cannot re-install it.
Once you've uninstalled Backup & Sync, even if you also uninstalled Google Drive for Desktop and run an old installer from 2019 of Backup & Sync ... the installer says "Backup & Sync" is not available anymore and leaves you with two options: 1) cancel 2) uninstall Backup & Sync (What?? I'm trying to install it...).
Anyhow I fell for the trap and I'm warning you to never, ever run Google Drive for Desktop on your computer.
I will also cancel my +100Gb subsription for 20€ per year, since it's kinda rendered obsolete if I can't use the desktop app for bigger files anymore. What's the purpose, really? The Web-only interface is trash (ZIPs multiple files and such bullshit).
The new Google Drive for Desktop app also installs some fake driver that makes a "G:\" drive appear on your Desktop.
When you look inside the "G:\" drive, what do you think you'll find?
"well I guess I'll find the content of my Google Drive, no?"
WRONG!!!
You'll find ONE shortcut ... to your Google Drive folder. 
Literal ... utter ... trash.
"There will be no end to the troubles of humanity, until philosophers become kings, or kings become philosophers.", Plato.
"Hyperbole will destroy us all.", Matt Dillahunty.
"The hyperbole, the demonization of the other opinion and the unwillingness to even read the opposing opinion destroys the so important political discussions necessary for the well functioning of society.", Couleur
