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

https://mill-wiki.win/index.php/Does_a_Virtual_Card_Work_for_a_ChatGPT_Plus_Trial_or_Will_It_Fail%3F

ChatGPT offers a permanent Free plan with basic features available to all users. Occasionally, targeted promotions provide a trial of the Plus plan, which may require a card and auto-renews unless canceled