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

https://oscar-wiki.win/index.php/What_Happens_If_My_ChatGPT_Trial_Ends_and_I_Don%E2%80%99t_Want_to_Pay%3F

ChatGPT offers a permanent Free plan with basic access for all users. Occasionally, targeted Plus plan trials are available, which may require a payment card and auto-renew unless canceled