> How can it be better than the OFFICIAL version!? How nexactly is that possible?

Some content, e.g. Netlfix, has DRM that limits the quality that you can view in certain browsers/operating systems.

As another example, a DVD/blu-ray sources are often significantly higher quality than what streaming services offer, so if you have a choice to watch some movie on Netflix or a pirated blu-ray copy, the pirated copy will often be higher quality than Netlify while being more convenient than blu-ray.

It in unclear though how you could possibly get higher quality than the best quality that the source offers.