Visualization can be used as a call to action, like in this chart on gender inequality in tech jobs. A simple idea of showing disparities in the tech industry becomes more effective because of conrete examples. Indeed, it’s much easier to grasp that Mozilla is currently employing 43 male and 453 female engineers as to look at dull statistics across the whole industry.
I wouldn’t normally recommend to use bubbles to compare two values (because the human brain percepts not the volume but the height of the bubble), but in this case this is a reasonable option. The only thing I’m skeptical about is how these companies were chosen – is that a representative sample?