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I’m guessing you aren’t a programmer or network engineer, because a relay does not necessitate storing anything. Your router does not “store” your webpages when you go to a page on the internet. Something like mulvad vpn doesn’t store anything when using it.
I don’t see where they said they camped in their car. They could have easily parked the car at the site and then set up a tent, or like we do, towed a pop up camper there.