ChatGPT is a privacy nightmare. When you disable "Chat history & training", this setting is stored client side in local storage. That means the setting gets lost when switching browser or deleting your browser cache.

Also, when you disable "Chat history & training", plugins are not available to you as a paid user.

I believe Sam Altman doesn't care about his users' privacy at all. I lost trust in him completely, when he first mentioned that he doesn't understand why decentralized Finance might be useful to people. Some months later, when Silicon Valley bank was in the process of shutting down, he started crying. At the same time he supports Worldcoin.