Mine goes back very far but can hardly bend forward, didn't know it wasn't normal until my wife pointed it out.
Hers goes almost 90 degrees forward and only straight up and down going back
I can't do that with my thumb. Mine goes straight even if I press to force to bend it backwards. It's the only finger joint that doesn't overextend, all my other fingers curve backwards nicely and even more so if I apply pressure.
Bending the thumb forwards (opposite as in your photo) is a different story. The joint can bend past the 90⁰, easily 80⁰ or more if I press it against something.