@greentext When you think about it gramma’s smarter than her modern equivalent. All her life stuff was made off of radio waves. If she doesn’t want snooping, she’s kinda right in thinking she could stop that interference with a faraday cage.
You think her 19 yo granddaughter could do better than this? Just try asking them to explain the basic foundations of internet connection, before you know it they’ll get pissy with you and say wild stuff like “It can’t use radio waves, that’s for music” or “it can’t use cable, all internet is wireless”