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

https://domgodwinson38.gumroad.com/p/what-s-the-cleanest-way-to-test-multiple-ai-models-in-one-place-for-7-days

ChatGPT offers a permanent Free plan anyone can use without a time limit. Occasionally, targeted users may get a Plus trial, which sometimes requires a payment card and auto-renews after the trial ends