got busted for not actually singing on their own album and lost the Grammy over it in 1990, pretty brutal fall from grace. Fab Morvan kept a low-key solo career going, but Rob Pilatus struggled hard with addiction and passed away in 1998. their name is basically shorthand for a lip-sync scandal now.
the producer Frank Farian was actually the one who made the call to have them lip sync, he'd done something similar with other projects before and got away with it.
there was a whole "Rob & Fab" reunion attempt planned before Rob passed away, it never really got off the ground.