Unless these businesses choose to make their own servers, then they can still be banned and lose their audience. And I don’t think a lot of them are going to realize that. However, going into the fediverse in any capacity is a step in the right direction, since you can just export a CSV file of the people you follow and import it somewhere else. Getting the people who follow you moved is a trickier thing, but some services like Mastodon do have that capability. So even if they start out on something like mastodon social and then realize they need their own server, they can set it up and then migrate.