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

https://eduardosnicechat.publishlane.com/posts/does-chatgpt-have-a-referral-link-trial-i-can-ask-a-friend-for

ChatGPT offers a permanent Free plan anyone can use without a trial. Occasionally, OpenAI runs targeted promotions for ChatGPT Plus free trials, which may require a card and will auto-renew into a paid subscription unless canceled