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

https://trentonsexcellentthoughtss.evergrovio.com/posts/where-exactly-is-settings-subscription-on-chatgpt.com

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