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

https://wiki-planet.win/index.php/Why_Does_ChatGPT_Plus_Cost_$20_a_Month_After_the_Trial_Ends%3F

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