99% of users don't even know they're being protected. There's no promise except "we work to make browsing safer" and cutting even 5% of malicious sites from a user's experience is an unmitigated win for that user at the low false positive rate Safe Browsing offers.
that doesn't make a difference, they're still being protected. 99% of users don't know that defender saved their lives multiple times from being destroyed either. Same with spam filters, app store rejections,etc..
I don't get why there is such a lack of critical thinking on this topic here.