> (12) PERSONAL INFORMATION. —The term 6 ‘‘personal information’’ means any information, re-gardless of how the information is collected, in-ferred, or obtained that is reasonably linkable to a specific consumer or consumer device.
So if you use an email address for your users to log in, or even a username, you are collecting personal information based on the vague nomenclature of this law. Device IDs might be the case too (though I think Apple at least now gives a per-app id, which means it can't be linked to external sources much now iirc).