Alternatively, you can contact/ask the people who wrote the paper if they can send you a copy. Usually they'll gladly send it to you for free. I don't believe they get any of the profit from the journal subscriptions/purchases. So they have no incentive to withhold it from anyone.
Except of you are doing research you'd need to write hundreds of emails asking for a paper, just to then find out that it doesn't contain the specific piece of information you are looking for.
No they don't get anything, but they are not allowed to share PDFs. They are allowed to share a link to a webviewer, even via social media. Preprints are also allowed.