Sorry, I was not clear.
Cryptomator is just searching for the standard folder that is usually created by gdrive/OneDrive etc.
If it does find this folder, it assumes that the corresponding sync client is available as well.
So when you have the option „gdrive“ available during vault creation, but you do not have google backup and sync installed, then the folder was not deleted after uninstalling the google app.
If you delete this folder, the option should disappear (please check if important files are in this folder before you delete it)