This argument comes up often but it's not convincing. You can't have your cake and eat it too. You can't distribute your content on a public (free) medium and also control how people consume that content. If you want control of how people use a thing, the internet is the worst possible choice.

It's really simple, if you want to put your content behind a paywall, then put it behind a paywall. Don't leave a backdoor open and then complain when people use that door.