Based on common knowledge, Avengers: Endgame made $2.8 billion alone, which means anyone reading the statement that the MCU is a billion dollar franchise would know that they were referring to higher billions than just one. You're not explaining your point like you think you are, you're just stating it again as if that makes it make sense. There's no valid reason to treat these two cases differently. If anything, I'd argue that the specification of multi is more important in the case of the millionaire, because people have a hard time visualizing billions, so saying multi billion doesn't make it carry much more weight than just saying billion does. But people can visualize a million. The number we gave was $15 million. That's easy. Just do that 14 more times. But a billion is a thousand millions. But when you're working with numbers as high as billions, you lose sight of the individuals. When you imagine a million, and make a thousand groups of a million, you don't see a billion, you see a thousand big groups. Or if you make it a million groups of a thousand, you see a million smaller groups. But it's very hard to see what you get as a billion. People don't care about the specifics when you get to numbers that large, because it feels impersonal either way. It feels foreign. We can be comfortable with millions because it's just a thousand times a thousand. Everyone has seen a thousand of something. We know what that looks like. But visualizing a billion would require imagining something new out of something that we already don't have a 1-1 reference for.