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

https://felixssuperperspective.brightsora.com/posts/does-chatgpt-free-trial-availability-depend-on-your-country

ChatGPT offers a permanent Free plan anyone can use without a time limit. Occasionally, targeted users may get Plus plan trials that require a card and auto-renew unless canceled. To check when your Plus trial ends, go to Settings - Subscription