[nedwin]

They're demonstrating that users are getting value out of it.

School administrators will pay for this system if they can demonstrate teachers want to use it and are able to get better performance out of their students by using it.

These users are also monetizable - if the system is entrenched in a school or district and they announce free + paid plans they can convert at least some of these to paying users - paid for by the school itself or school district.