This is a smart feature of OpenAI: you can use the service without logging in.
Do you still need to log in? try again
The company will profit from it in the form of more effective training of the system and perhaps manage to convince even more people to carry out a quick account creation. Note that free users still only have access to ChatGPT 3.5 and not the best and latest 4.0 model which costs from $20 a month for single users. Paying members get:
It has long been possible to log in with accounts other than OpenAI's, such as Google, Microsoft, and Apple, but now you also avoid that in addition to the fact that you can deactivate the sharing of user behavior from the settings. If you are not logged in, the service will also block several requests and image generation in several categories.