Who is this for? Is there anyone reading the article that can't grasp what a terrabit is but can somehow conceptualise one million 4k videos streaming simultaneously? I don't think anyone sits in that venn diagram.
The best, meaningful comparison I've read is from Bill Bryson in A Short History of Nearly Everything. In it, he notes that there are 1M seconds in 11 days but 1B seconds takes 32 years.
Non-tech savy users know how live streams crash with sports like with Netflix recently during boxing etc or on Twitter last year and usually those come with some n Million users in kind of headlines or the like, so they have some reference to that scale.
As analogies go, there are worse examples. BleepingComputer is hardly the New Yorker or Atlantic, best we can hope for these days is a human is writing the article I suppose.