This page covers a video from Dib Games titled "How to get Money in GTA 5 story mode (Stock Market Money Guide)." The snippet suggests it is a guide on making millions using the in-game stock market in single-player mode.
This is a legitimate, intended game mechanic, not a glitch. The stock market in GTA 5 story mode is designed to react to specific missions you complete. By investing before certain assassination missions given by Lester, you can reliably earn large returns. Because this is an official feature, there is no ban risk for using it.
However, the exact timing and which stocks to buy can be tricky to follow perfectly. The video likely shows the correct order of missions and investments. As with any guide, verify the steps are still accurate for your version of the game. Check the video's comments or a recent update note to confirm the method works before you start investing.
