Admins can easily revoke channel access at any time.
In order to do so:
Log in to your master enterprise vidIQ account.
Navigate to the top-right corner and click on your icon.
Select the channel
Click "Channel Settings"
Find the member you want to remove.
Click "✖️" button next to the member's name.
Click "Save".
The member will immediately see changes in their vidIQ account.