ChatGPT offers a permanent Free plan with basic access for all users....

https://future-wiki.win/index.php/Does_ChatGPT_Free_Ever_Expire_or_Turn_Into_a_Paid_Plan_Automatically%3F

ChatGPT offers a permanent Free plan with basic access for all users. Occasionally, targeted promotions provide free trials for the Plus plan, which may require a card and auto-renew into a paid subscription when the trial ends