ChatGPT offers a permanent Free plan available to all users with basic access....

https://victor-wiki.win/index.php/Why_Do_Two_People_Get_Different_ChatGPT_Trial_Offers%3F

ChatGPT offers a permanent Free plan available to all users with basic access. Occasionally, targeted promotions include free trials for the ChatGPT Plus plan, which may require a payment card and auto-renew after the trial ends