That's a non-sequiter. I'm paying for my seat and space, which includes the use of the tray table in front of me.
I blame the airline for allowing the seats to recline as far as they do and squeezing the seats closer together front-to-back versus what they were 20 years ago.
Again, the reclining seat is an option. Removing my kneecaps is not.
I blame the airlines too. But the person sitting in front of you pai for a seat that reclines. You are expecting as a right that person to surrender what he paid for, so that you can receive more than you paid for? Pretty nervy. But this seat jamming device should be right up your alley.