[andrewia]

I think that's only for the Wi-Fi printing. The HP smart app is terrible and makes you sign up for features that work on a local network. I just visit my printer's internal web server with a desktop user agent to show the "remote scan" features. Printing over local Wi-Fi doesn't need the HP Smart app, just the HP print service plugin that doesn't require login (and also conveniently enables USB printing, if you want to use an OTG dongle with your phone).

[macNchz]

My brand new HP laser printer literally won’t do anything until you use the app to set it up and agree to never disconnect it from the internet or use an unapproved cartridge. This is what the printer’s internal web server shows: https://pasteboard.co/L4AbwCTw7G3s.jpg