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

https://lanesniceblog.scriblorax.com/posts/is-there-a-standard-1-month-chatgpt-plus-free-trial

ChatGPT offers a permanent Free plan that anyone can use without a trial. Occasionally, targeted users may get a Plus plan trial, which sometimes requires a payment card and auto-renews if not canceled