Strategically, Apple's not setting themselves up for success here by giving Apple Business away for free (with paid per-user storage bumps).

As a lot of people on this thread have pointed out, Apple's Business Manager needs a lot of improvements. ("Bring your own device" support is terrible, for example. Changing business names requires a perilous migration step. Support reps don't have the tools to fix serious issues.)

If Apple Business were a real revenue source, if they charged luxury prices for a luxurious business support experience, they could pay for developers to fix their stuff.

Instead, Apple Business is a free side hustle for Apple, a hobby. But they're proposing to control your entire domain, to Domain Lock all Apple accounts for your domain, to put your businesses's life in their hands, for "free."

Don't fall for it.