ChatGPT offers a permanent Free plan for everyone. Occasionally, targeted users...

https://juliet-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 for everyone. Occasionally, targeted users get a free trial of the Plus plan, which may require a card and auto-renews when it ends. To check your trial’s end date or manage your plan, go to Settings > Subscription.