So is that's your fundamental issue with a paywall? Anything that's available to Google (and Bing, DDG, etc) should also be available to you at no cost?
Restating that from the other perspective: if the information isn't universally available for no cost, it cannot be looked up via a search engine?
It's crazy to send them the content but tell them not to read it... back to your example would you expect your bank to do that? Here's all the account details and transactions but oops thats not your account. I'm guessing no, you'd hold your bank to a high technical standard.
To be clear, if newspapers/journalists want to work out some special agreement with google (or partner/agreed upon indexers) so their requests are authenticated so that only they have access to the content - i think that is a better solution then pay walls and sending the article and saying "don't read this please"
But regardless of how crazy this scheme is, I don't think it justifies taking advantage of that craziness to unwrap such content.
I think it's reasonable to question the approach of banning the plugin too: the problem is the users' choice to use the plugin, not making it available. But ... when there's no justifiable use for the plugin, and the author clearly intends it to be used to view unauthorized content ... I can see that it's an attractive strategy to just ban it.