I'm all in on GDrive - my whole world is in there. 25 years of files. I do notice Spam occasionally in the 'shared with me' menu - but it seems to get cleaned up. I already have all 99% notifications turned off in apps. Sounds like the real annoying part is getting the notification with the spammy sexual titles. If you didn't get notifications then likely the spam detection would delete before you ever noticed it in…
Given Google's track record this exhibits a level of faith I would find hard to muster. I really hope you still have the offline backups.
And they have great export via Google Takeout which I do regularly to some giant tarballs (and ironically put on my otherwise empty dropbox)