There's definitely some that are. I pet sitted the cat of a friend which had a feeder and the cat always tried to do the same technic of putting his paw into it and it never worked. The crazy thing is that it was clearly a cheap product as it was powered by USB and both side of the cable was USB A.
https://petspruce.com/tamper-proof-automatic-cat-feeder/
https://felinefollower.com/top/tamper-proof-automatic-cat-fe...
Also, is this site hosted on a solar powered raspberry pi? It's down with 5 comments and 20 upvotes.