This is very stupid. No one wants this. People don't like false sincerity. Even when we know that it's someones job to be nice, we appreciate when it feels genuine.

If you want people to genuinely be nice, give them reasons. Make them happy. Help them stay motivated. Otherwise you cheapen "please" and "thank you" even more than is already the case and get zero value out of it because no one will appreciate it knowing that it's forced.

A world where everyone says "please" and "thank you" isn't a better world.