ChatGPT offers a permanent Free plan with basic access for everyone....

https://www.slideserve.com/aaron_ward92/how-to-explain-to-your-boss-why-there-s-no-guaranteed-chatgpt-pro-trial

ChatGPT offers a permanent Free plan with basic access for everyone. Occasionally, targeted users may get a Plus free trial—these often require a credit card and auto-renew into a paid subscription unless canceled