ChatGPT offers a permanent Free plan with basic features available to everyone....

https://wiki-site.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 with basic features available to everyone. Occasionally, targeted users may get a Plus plan trial, which sometimes requires a payment card and auto-renews when the trial ends