Comment by WJW

Even normal fridges are a memetic virus, fridges clearly live in a symbiotic relationship with humans. They make our lives better and in return we create more fridges. If they weren't useful to us, we'd stop making more fridges. Any medieval human who sees a fridge would instantly recognize why it's useful and valuable.

OP is right, anything popular is virus-like. Richard Dawkins invented the word meme for this all the way back in 1976.