It is not the task of mail providers to block or hide email considered to be spam. It is the job of the end users, ie the email providers cusstomers and their software.
Consider physical junk mail, ie the type that comes through the letter box. The post office does not decide what is junk mail or not, their job is to deliver it and it is the customer's job to discard it.
The proper thing is for the mail provider to tag the emails their systems consider to be junk and deliver it the customers inbox and let the customers decide.
Google's customers are the problem, not Google itself.