Yes, looks like it’s possible. There is a Try ChatGPT button.
Taking in consideration that your browser is most probably fingerprinted by now in their system, I doubt it makes any difference. The only shady thing was that you had to use your phone number to register.
Already tried that, it only presented me with “Log in” and “Sign up” buttons, no prompt box.
I have a number of Firefox addons that make this very hard for them. If they can identify me, OK, but I want them to work hard for it. I am not going to just admit “here is my email, this is me”.