ChatGPT offers a permanent Free plan for all users, while ChatGPT Plus trials...

https://johnathankvdj950.wpsuo.com/can-i-use-a-chatgpt-trial-more-than-once-on-the-same-account

ChatGPT offers a permanent Free plan for all users, while ChatGPT Plus trials are occasional offers for selected accounts. Some Plus trials may require a payment method and will auto-renew when the trial ends