I don't understand why people are paying for ChatGPT

I'm using ChatGPT daily for my work and it's absolutely perfect. It used to work with a one month trial period after which I was able to switch to a free service that gave me 20 requests per day. So yes I'm still using it for free for personal and professional use and I have no need to pay for it.<br><br>I'm really wondering, how come it isn't free for everyone?