I see what you’re getting at, but I think ‘moral high ground’ might not be the phrase you’re looking for.
Laws and morals are explicitly different. That’s why juries exist, so that a law may be put against the morals of a situation and the morals may prevail if need be.
Breaking the law isn’t necessarily immoral. It’s just illegal. So it isn’t like someone breaking the law is seeking to take the moral high ground in the first place, nor does that mean that someone who only ever follows the law always has the moral high ground. Lawful-evil does exist.
I mean, what kind of immoral bastard would let their donkey sit in a bathtub anyway?? https://americanbathfactory.com/blogs/news/crazy-bathtub-laws
Your argument falls though when you start personally benefiting from you pirated media. If you don’t want to support companies don’t watch or use there products and don’t give them your money