Does repetitive movement cause any musculoskeletal medical problems for long term? (carpal tunnel, arthritis of wrists, micro fractures , tenosynovitis etc?)
How do competitive players do after age 40-50? They may have more problems.
This snake shot does not appear to be healthy (when done thousands of times especially) ..Glove or a wrist band may be necessary to protect the wrist.
I am not sure. Foosball may be neutral, harmful or may be even helpful for some medical problems) for the wrist and fingers. probably good technique is fine for the wrists, but improper technique may cause long term problems.