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 your 'Shared with Me' menu.
Android needs to default to opt-in notifications like on IOS.