Livestream does not require viewers to pay for a Livestream subscription if they are simply looking to watch an event that an organization is hosting on Livestream.
If you are being asked to submit payment to watch an event or to enter a password to access an event, this is at the discretion of the Livestream account owner producing the event. Any questions regarding event costs or event access should be directed to the organization producing the event.
If you would like to chat during an event, you may still need to create an account depending on the event owner's settings, but there is no need to provide any payment information to Livestream.