I think a big difference here is that Cardinal Burke is an America and he is far more likely to pressure bishops to enforce it.
The question is how does this sort of thing get enforced!?! If you know of a priest who does this, should a layman contact his superiors, or contact the Vatican directly? If it is a bishop who commits the offense, who do you report it to? How is the Vatican to act, if they don't know of the sin?