"The term cybersecurity purpose means the purpose of ensuring the availability of a system or network from misappropriation of government information, intellectual property" this means a company like Google, Facebook, Twitter, or AT&T could intercept your emails, posts, text messages, etc., send copies to one another and to the government, and prevent them from reaching their destination.
Outside the snippet
"No civil or criminal cause of action shall lie or be maintained in Federal or State court against a protected entity, self-protected entity, cybersecurity provider, or an officer, employee, or agent of a protected entity, self-protected entity, or cybersecurity provider, acting in good faith for using cybersecurity systems or sharing information."