The conviction rate is 99.3%. By only stating this high conviction rate it is often misunderstood as too high—however, this high conviction rate drops significantly when accounting for the fact that Japanese prosecutors drop roughly half the cases they are given. If measured in the same way, the United States’ federal conviction rate would be 99.8%.[14][15][16]
From wikipedia.
This is one of those laws where I fundamentally disagree with the state having the power to make laws like this because the power will be misused, but in this instance, I actually think the law seems fine? Its not just exposing actual luxurious lifestyles like you imply, its also people going into debt to fake a higher level of lifestyle than they actually live, and this self perpetuates through social media like a virus.