"Everyone has to share everything" is a restriction, not a freedom.

Where did that come from? 'You aren't allowed to prevent others from sharing this thing' is completely different from 'you have to share this thing'. 'Everyone is allowed to share everything' is a freedom, not a restriction.

Whether or not it's a freedom people should have is a difficult question to answer because we don't know what the modern world would be like without copyright (I expect creators would try and get paid for creating more works so it might look like how nowadays some shows end in cliffhangers to give the creators some leverage over the publishers to say 'look, people want to know what comes next, maybe you should let us do another season').