ChatGPT offers a permanent Free plan anyone can use without a trial....

https://yenkee-wiki.win/index.php/What_Should_I_Do_If_I_Need_a_Trial_for_Work_But_OpenAI_Isn%E2%80%99t_Targeting_My_Account%3F

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