Can CASB publish a list of SaaS services to be blocked by a firewall or proxy?
CASB Audit will report discovered IP's and URL domains of interest used by an app. This data can be copied to the clipboard from the find and compare services in audit.
The DOI Domains of Interest can be imported and blocked at the firewall or proxy.
A CloudSOC Access enforcement policy can block access to groups of people, but blocking at the firewall or proxy maybe more appropriate for an entire site.