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

https://mega-wiki.win/index.php/How_Do_I_Know_If_My_ChatGPT_Trial_Will_Auto-Renew_and_Charge_Me%3F

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