Duolingo was incredible to get my kids engaged with chess past USCF 1000

It also was super helpful in maintenance of a 3rd language spoken at home.

Maybe that's where the problem is. Perhaps it should be a requirement that an app must be winner in the consumer education market before it can be sold to the education bureacracy. If an app survived the cutthroat education app B2C market, you know it works well for B2E market