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

https://domgodwinson38.gumroad.com/p/what-models-can-i-use-in-suprmind-s-trial-besides-gpt

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