I'm surprised they haven't gone down the route of TaaS (Toothbrush as a Service), where they sell a crippled device, and for a monthly fee of a few dollars, it

I'm surprised they haven't gone down the route of TaaS (Toothbrush as a Service), where they sell a crippled device, and for a monthly fee of a few dollars, it will unlock a premium 'Ultra Fast Brush Speed' a la Tesla.