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Just incline your fridge a bit so the door closes on its own weight.

A no tech solution is better than a low tech solution.

This doesn't work; the door needs to swing to 140 degrees, once it swings past this range, it would never be able to round the corner to close.

What if there's an obstruction?

Then it won't be able to close.

The main reason my fridge door doesn't close is if there's an obstruction. So a motor won't do much (unless its unreasonably strong). It's easy enough to adjust a fridge to tilt slightly backwards so gravity closes the door by itself.

what if the cat’s inside?

Depends whether the cat is dead or alive

It's both