So long as personal information is not collected, consent is not morally necessary.
If I collect information on how often a coin-op Street Fighter II game is played in an arcade, while collecting no personal information, consent is not needed.
Because using someone else's hardware in a public space is clearly equivalent to using your own hardware in the privacy of your own home.
Because using someone else's hardware in a public space is clearly equivalent to using your own hardware in the privacy of your own home.