ChatGPT offers a free plan that anyone can use with no time limit....

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

ChatGPT offers a free plan that anyone can use with no time limit. Occasionally, targeted users get free trials for the ChatGPT Plus plan, which may require a payment card and will auto-renew unless canceled