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

https://penelopessmartdigests.talesignal.com/posts/can-i-request-a-chatgpt-plus-free-trial-from-support

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