For the small businesses that I know of, one engineer who knows the operational side decently well has been the norm for a long time. In the '90s it was one of the programmers who happened to know enough Solaris to double as the Unix Sysadmin. Maybe one genuine full-time sysadmin if the company grew a little larger. Now you have someone who knows enough AWS to fill that role, which doesn't seem all that different in staffing levels.