ChatGPT offers a permanent Free plan anyone can use without a time limit....

https://zandersexcellentblog.quillnesty.com/posts/where-do-i-find-the-end-date-for-my-chatgpt-free-trial

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