The second it became cheaper to not apply it, every state under the sun chose not to apply it. Whether we're talking about Chinese imports that absolutely do not respect copyright, trademark, even quality, health and warranty laws ... and nothing was done. Then, large scale use of copyrighted by Search provider (even pre-Google), Social Networks, and others nothing was done. Then, large scale use for making AI products (because these AI just wouldn't work without free access to all copyrighted info). And, of course, they don't put in any effort. Checking imports for fakes? Nope. Even checking imports for improperly produced medications is extremely rarely done. If you find your copyright violated on a large scale on Amazon, your recourse effectively is to first go beg Amazon for information on sellers (which they have a strong incentive not to provide) and then go run international court cases, which is very hard, very expensive, and in many cases (China, India) totally unfair. If you get poisoned from a pill your national insurance bought from India, they consider themselves not responsible.
Of course, this makes "competition" effectively a tax-dodging competition over time. And the fault for that lies entirely with the choice of your own government.
Your statement about incorrect application only makes sense if "regulatory regimes" aren't really just people. Go visit your government offices, you'll find they're full of people. People who purposefully made a choice in this matter.
A choice to enforce laws against small entities they can easily bully, and to not do it on a larger scale.
To add insult to injury, you will find these choices were almost never made by parliaments, but in international treaties and larger organizations like the WTO, or executive powers of large trade blocks.
