Site Isolation: How Agencies Stop One Compromised Client from Taking Down the Rest

https://ourcodeworld.com/articles/read/2564/best-hosting-for-web-design-agencies-managing-wordpress-websites

I've woken up at 3am to alerts before. One client site overloaded a server, a second showed a defacement, and suddenly a dozen clients were furious even though only one site had been breached