ChatGPT offers a permanent Free plan anyone can use without a time limit....

https://telegra.ph/Can-I-Use-a-ChatGPT-Trial-More-Than-Once-on-the-Same-Account-08-15

ChatGPT offers a permanent Free plan anyone can use without a time limit. Occasionally, targeted users may get trials for the Plus plan, which sometimes require a credit card and auto-renew after the trial ends