A cracked addon that worked in v12.00 might completely break in v12.05, and because it's cracked, the user has no access to the developer's patches. The Dangers of Using Cracked Addons

The most immediate and serious threat from downloading cracked add-ons is malware. These files are often modified by unknown third parties and can contain malicious code. The threat isn't just theoretical. For example, the website macxzb.com, which offers a "X-Plane 12 For Mac v12.01r3 模拟飞行游戏中文破解版" (a cracked Chinese version), includes a suspicious "X-Plane 12 Demo Patcher" program for activation. The site even lists many error messages associated with macOS security systems, such as warnings that a file "may contain malware" or "cannot be opened because the developer cannot be verified". These are clear red flags. By running such a patcher, you are giving an untrusted piece of software full access to your system, which could lead to identity theft, data loss, or your computer being enrolled in a botnet without your knowledge.

Cracked addons undermine the hard work of legitimate developers who charge fair prices for their products.

A "free" plane might end up costing you everything on your hard drive, as cracked files are a common delivery method for ransomware that locks your files.