What data do you think they're "harvesting"? If they're counting how many shots I pull and judging me by my choice of brew temp, I can live with that. The app adds a lot of convenience and saves having to have some sort of UI or manual control on the machine itself.

I understand the concerns with telemetry, but I can’t bring myself to care if La Marzocco can track how often I backflush my espresso machine.

But if it’s a principled thing for you, I get it.