Not only are they rigged, but they're designed to be easy to rig.
Why they're not classified as "games of chance" is beyond me. Lining up the claw over a given tchotchke sounds like it's the least important determiner of whether the claw successfully brings it back to you.
(h/t +Les Jenkins)
Claw machines are rigged — here’s why it’s so hard to grab that stuffed animal
Want a nice stuffed animal? If you’re using a claw machine, be careful: the system is rigged.
Overall I did pretty good at these I would one out of four which isn't bad