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

https://spark-wiki.win/index.php/Is_the_ChatGPT_Student_Offer_Actually_a_Free_ChatGPT_Plus_Subscription%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