Is this normal play for a rear derailleur screw, any way to adjust it or is it just worn from regular use

b-bolt on sx, nx and gx is bad.

You can replace it with xo1/xx1. Just search on yt for deraileur b-bolt.

I have the same amount of play and the same scuff mark on the side 😅 i have also always wondered if everyone’s derailleur has that much play