Natural consequence of cheap unlimited quota is slow speeds
The Tragedy of the Commons means that most people will not use shared resources efficiently especially when isolated from other users.
As the last mile becomes faster, those on unlimited connections will leave 4HD Stan, etc. running for background sound or simply because they don't care. If a few people do this network performance for everyone is trashed.
The sensible alternative is quotas which are used to manage other shared resources (e.g. fisheries).