OS: Windows Home users are more likely to experience permission and Windows Controlled Folder Access issues.

-> indicators for pirated/free OS versions can be seen if you know what you are looking for - e.g. LTS editions which once could be used for free if you know how to trick the software have often issues nowadays since Microsoft is against continous free use of their software

System Manufacturer aka mainboard: ASUS is known for bloatware which interferes with multiplayer, MSI is known for bloatware which cause crashes

CPU & RAM: Performance baseline

Page File aka virtual RAM: Important for gaming - recommended: 1,5x - 2,5x of RAM

Display Devices: if multiple are available there is a chance that the user did not set it correctly; you can also reliably read what driver version is actually installed rather than user just telling you "latest"

-> especially laptop users have issues if they game with default factory settings

More devices: the number gives a general idea of possible issues - the more devices are connected the more likely it cause power issues and other unexpected issues such as loose contacts

-> recommend users to try again having only necessities plugged in aka mouse, keyboard and display

Disk Drives: gives reliable information how much space user really has available; always to mind installation folder and temporary download folder can be placed on different storage drives - it also tells you about performance depending on storage device type

Error messages: major errors are logged with explainations in the report; the report is reliable when it comes to common issues caused by bloatware, memory leak or other things - users often claim "they have only issue with one game" while the error lists reveals almost always that users have had problems before - you can also see indicators what might be the cause of issue such as e.g. ntdll.dll as an indicator to OS compatibility issues or stackhash errors as indicators for faulty security suites.

Unless user uses their real name for their PC there is no personal information which can be abused in the DxDiag report.