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

https://online-wiki.win/index.php/If_My_Trial_Already_Expired,_Can_I_Get_the_Paid_Features_Back_Without_Paying%3F

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