This is a good explanation of why people think it made sense for Disney to buy Twitter, but I don't buy it. The problem with this approach is that Twitter doesn't own any of those big celebrities or have any way of enforcing them staying on the platform.

When you buy the record label that Katy Perry has a deal with, you're buying it because Katy Perry has a deal in place to make N more records for that label.

When you buy Twitter because Katy Perry is on it, you're not getting anything. She could shut down her Twitter tomorrow and tell all her followers she's only on Instagram.