And Firefox with one single website. But even so, the test is interesting because others can run a more realistic use case and report on that.
Maybe they shouldn't use tons of memory carelessly.
But they do. And not necessarily carelessly.
There seems to be a pretty consistent pattern of Chrome and apps built with Electron having large memory footprints. You should turn up here when an Atom article hits the front page and see how HN commenters' attitudes to memory consumption change then...