Absolutely no legal weight. However, when you change a promise publicly, you signal a change in direction. It is much more honest than leaving it in place but

Absolutely no legal weight. However, when you change a promise publicly, you signal a change in direction. It is much more honest than leaving it in place but violating it behind the scenes. If the public really cares, they can pass a law via their democratic representatives (or Google can swear a public oath before God I suppose).