ARCHICAD 24 Reference Guide 223
Sign In with GRAPHISOFT ID
Signing in with your GRAPHISOFT ID (GSID) is required
• to publish a BIMx Hyper-model to the BIMx Model Transfer Site
• to manage your GRAPHISOFT licenses using License Manager
• to activate BIMcloud Basic
So if you are not doing any of these things, there is no need to bother.
And if you do try to do one of these and you haven't already signed in, you will just be prompted to sign in anyway.