Our ComfyUI URL is using an unique UUID URL that changes every time you launch a new machine, but for the duration of your current session if you share that URL to others, they will see the ComfyUI interface and your work within that session. It is super hard for malicious attackers to figure out your URL by guessing and collision though.
Please share your ComfyUI environment the proper way by using the Share feature in RunComfy.
We understand your privacy and data safety is most important to us and we are trying our best to protect your data.