I don't believe they're added after every message. I think this may be one of the reasons why Bing slowly goes out of character.
As for ChatGPT, I think the technique is slightly different - if I had to make some fun guesses, I'd say the rules stay while the conversation context gets "compressed" (possibly by asking GPT-3 to "summarize" the text after some time and replacing some of the older tokens with the summary).
As for ChatGPT, I think the technique is slightly different - if I had to make some fun guesses, I'd say the rules stay while the conversation context gets "compressed" (possibly by asking GPT-3 to "summarize" the text after some time and replacing some of the older tokens with the summary).