Hello, If you use Android, it is next to impossible to get rid of Google as Android is a Google product. If you want to completely want to get rid of Google, you will have to root your device and install another OS (Operating System) such as LineageOS (works with only compatible devices). Many other OS allows you with the option to not install Google Play services, hence removing Google services completely from the device. In conclusions, till the time you will be on Android you will have to bear with Google Services. Wth respect to you using ChatGPT and Google Sign-In popping up, maybe due to certain changes made by OpenAI in their policies of number of free prompts a user can use before they need to sign-in (but this is I am speculating). Hope this information helps.