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

https://stateofseo.com/does-chatgpt-free-ever-expire-or-turn-into-a-paid-plan-automatically/

ChatGPT offers a permanent Free plan with basic access for all users. Occasionally, targeted promotions provide a free trial of ChatGPT Plus, which may require you to enter payment info and auto-renews when the trial ends