ChatGPT offers a permanent Free plan anyone can use without a trial....

https://romeo-wiki.win/index.php/Is_There_a_ChatGPT_Business_Free_Trial_Button,_or_Do_I_Have_to_Talk_to_Sales%3F

ChatGPT offers a permanent Free plan anyone can use without a trial. Occasionally, OpenAI runs targeted promotions for ChatGPT Plus free trials, which may require a card and will auto-renew into a paid subscription unless canceled