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

https://www.joint-bookmarks.win/chatgpt-offers-a-free-plan-that-anyone-can-use-without-time-limits

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