This video from Axerzz claims to show a solo glitch for earning casino chips quickly, with the title suggesting no requirements and a fast payout. The snippet calls it one of the easiest casino money glitches in GTA 5 Online.
If this is an exploit of the casino chip system, it is almost certainly patched or will be patched very soon. Rockstar regularly fixes these types of money glitches. Using glitches like this carries a ban risk, especially if you earn large sums of chips or convert them to cash too aggressively.
Before you try anything, check the video upload date and the comments for recent reports on whether it still works. Do not rely on this method for steady income, as it will likely stop working without warning. If you do attempt it, avoid doing it on your main account if you are concerned about your progress.
