What is forcing Patreon or any other company to allow you to export your subscriber list? And do you have a right to export even if your account has (wrongly?)

What is forcing Patreon or any other company to allow you to export your subscriber list? And do you have a right to export even if your account has (wrongly?) been banned. Unless there's some kind of regulation involved, this is the kind of thing that easily could cease to work as expected once a company has enough market share.