The market for cybersecurity solutions never declines; there are always new and more malicious threats around the next corner. The market has never seen as much demand as during the recent COVID-19 crisis.
As you probably know, Varnish has always been a very secure piece of software but so far, that safety only applied to itself and therefore, a malicious request could still go through it and hurt your backend. But as a reverse-proxy (load-balancer, origin shield, etc.), Varnish is going to see everything the backend receives and sends, so there's a great opportunity here to sanitize the traffic before it reaches it.
The Varnish Web Application Firewall (WAF) is finally available.