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

https://zandersexcellentblog.quillnesty.com/posts/do-chatgpt-free-trials-require-a-credit-card-or-not

ChatGPT offers a permanent Free plan anyone can use without a trial. Occasionally, OpenAI runs targeted promotions for ChatGPT Plus free trials, which may require a card and will auto-renew into a paid subscription unless canceled