Here’s a solid blog post on the topic, written to be informative while staying on the right side of copyright and fair use discussions.
An is a file format used by Nintendo to deliver digital games, updates, and downloadable content (DLC) through the official Nintendo eShop.
An file is a digital game format used by the Nintendo Switch. Officially, these are the files downloaded directly from the Nintendo eShop when you purchase a game legally.
Websites that advertise free NSP files for high-profile games rarely do so out of generosity. Downloading files from untrusted third-party repositories exposes you to several major threats. 1. Malware and Ransomware
For those looking to get LEGO Star Wars: The Skywalker Saga on the Switch for free, there are a few options available. One popular method is to download the game in NSP format from a reputable source. NSP (Nintendo eShop) files are a type of file used by the Nintendo Switch to distribute digital games.
If you're interested in the game, I can instead offer:
Digital sales happen regularly, especially during holiday events, May the 4th (Star Wars Day), and publisher sales. You can often find the game at a fraction of its original retail price.