ChatGPT offers a permanent Free plan anyone can use without a trial....

https://kilo-wiki.win/index.php/How_to_Cancel_a_ChatGPT_Free_Trial_So_It_Doesn%E2%80%99t_Charge_Your_Card

ChatGPT offers a permanent Free plan anyone can use without a trial. Occasionally, targeted users may get a free trial of the Plus plan, which sometimes requires a card and auto-renews when the trial ends