Aliens?
There was an article in the "Daily Express" about somewhere in Wales being a UFO hotspot.
Also why would aliens use Wifi? Surely they have moved well beyond using radio waves, thought the latest concept was coherent neutrino beams? Can go 500 light years and still be detected, but show up on "lesser" species radar as astronomical phenomena.
Maybe the fast radio bursts are beacons telling folks where the interesting sights are, or adverts for "Extend your Pseudopods with this One Weird Trick" intergalactic spammage.