Re: isit737max.com
When the planes started crashing, Ryanair announced that the substantial number they were buying (50?) would be part of their general fleet, rather than flying on specific routes. So the only way to be sure would be to line up at the gate and read the registration on the plane. Of course, you could always walk away from the gate. But Ryanair would still have your money by then, which is what they care most about.
Unless all Ryanair flights are marked as "MAYBE - do you feel lucky?", which rather defeats the point of the site, then the information isn't going to be all that helpful.