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

https://tiny-wiki.win/index.php/Is_There_a_Standard_1_Month_ChatGPT_Plus_Free_Trial%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