I would expect those features would not be very useful in that situation, due to the differences in the burden of proof and the rules of evidence in a court of law and in the court of a suspicious spouse.
If you emergency wipe your phone when you see the police knocking on your door that is quite unusual, but it just indicates that you have something you do not want the police to see, and that keeping your secret is important enough to go through the hassle of dealing with a wiped phone.
That something might be completely non-criminal but that would be extremely embarrassing or socially or professionally damaging if it got out. Even if it is something criminal, it might not be the particular crime that the police and prosecutor want to charge you with. The prosecutor needs to prove you did that particular crime, not merely that you have secrets (everybody has secrets), and so the fact that you wiped the phone probably isn't even admissible as evidence.
Emergency wipe your phone when it looks like your spouse may get a hold of it? Good luck talking your way out of that.
Of course there are legitimate cases that want to use these features, but I have my serious doubt there's enough legitimate market to support such a price.
