For example, I currently have a company that I technically manage. It has one employee who does maintenance on the infrastructure (AWS Elastic Beanstalk), database (AWS RDS), and code for five different products. The only other people who touch the code are security auditors.
That just wasn't possible 10 years ago. Managing servers alone for those products (~50 EC2 instances, ~10 load balancers, 10 database instances) would've been a full-time job.