I have yet to see unpaywall workk ever. All that site does is link you to free versions if legally available. So it does nothing. Bypass Paywalls clean sometimes works, but if you want non mainstream sites going to archive.today is the most reliable option.
Yeah, they are my most reliable anti paywall technology. wayback machine is down very often right now, but for the express porpuse of getting rid of paywalls archive.today works very well for me