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

https://spark-wiki.win/index.php/Can_I_Use_a_ChatGPT_Trial_More_Than_Once_on_the_Same_Account%3F

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