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

https://oliviasinsightfulthoughts.novacrestiq.com/posts/if-i-don-t-add-a-card-to-a-chatgpt-trial-what-happens-at-the-end

ChatGPT offers a permanent Free plan anyone can use without time limits. Occasionally, targeted users get a Plus plan trial, which may require a credit card and auto-renews when the trial ends