ChatGPT offers a permanent Free plan anyone can use without a time limit....

https://wiki-nest.win/index.php/Can_I_Keep_My_Chat_History_if_I_Drop_from_ChatGPT_Plus_Back_to_Free%3F

ChatGPT offers a permanent Free plan anyone can use without a time limit. Occasionally, OpenAI runs targeted free trial promotions for the Plus plan, which may require a credit card and automatically renew after the trial ends