Yeah, the y-axis is unlabeled, but at least the title still tells you what it is: traffic. Doesn’t even have any numbers, so there’s no need to ask about the unit either.

This is more like the graphs made at the marketing department where km becomes KM, because it looks cooler. Same goes of MG, because why not. Is that milligrams or megagrams? Don’t worry about it. I mean, it’s just numbers, so who cares anyway. It’s not like anyone tries to calculate something with them. It’s well known in the marketing department that no human on earth is able do things like that.