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Grand Theft Auto Online has cultivated many mysteries and rumors over the years, and there are a few things fans have wondered more endlessly about than a Casino.
Now, a new rumor and subsequent changes in-game seem to hold some answers.
The Casino has been something of an enigma, and a point of many fake leaks, for years. Since the launch of GTA 5 back in 2013, the imposing building sat unused, closed and with an "Opening Soon" sign in front of it.
Players often took the sign for granted, assuming that a Casino themed DLC with gambling will be added to the game at some point.

This became a prominent theory and a few modders tried to cash in on upvotes with a few fake leaks, such as that one time when the sign in front of the casino allegedly changed. This time, however, it's clear that something is happening.
The first indication was a Tweet from well-known GTA Online informant Tezfunz2, a reliable source of leaks and information gained from data mining. The Tweet reinforces rumors that the next major GTA Online DLC will involve the casino, and that week-by-week we'll be seeing in-game changes to the building itself.
While the source is a reliable one, the rule of thumb is to never fully believe something coming from an unofficial source. However, the leak was followed by actual in-game evidence: there have been visible changes to the casino in-game.