I think the problem I responded to is of the ticket machine. The ticket machine is the property of the second party, and an agent for it, so hiding that is disi

I think the problem I responded to is of the ticket machine. The ticket machine is the property of the second party, and an agent for it, so hiding that is disingenious at best, and misleading at worst. Your computer should be (although often isn't) doing things on your behalf, and only yours. There, the insertion would be jarring, and an encroachment. I'm not quite sure where on that spectrum stand services which deliberately insert themselves between you and your data, like Dropbox or Google Sheets.