Completely agree with Sliggy on this
Gonna waffle a little to help the scene understand why things aren't so simple:
Riot can't allow gambling in VALORANT for one simple reason, their target demographic
VALORANT is rated +16 and their target demographic is teenagers and young adults, therefore they cannot allow gambling sponsors into their eco-system as it would result in Riot potentially being banned from advertising VALORANT to their target demographic in states like California and regions like EU. There is a reason why Valve does almost zero advertisement for games like Dota and CS2 and it is simply because they don't wanna get even more fines from governments. The reason why Valve for example removed in-game banners in Dota 2 right before this years The International is 100% because they got a letter for either the EU or the Danish government about potential fines as teams used those banners to advertise gambling sites which are banned (For example 1XBET one of the biggest sponsors in Dota2 is banned in Denmark)
From a tournament organizer perspective, it is easier to fund tournaments in CS due to how much gambling sponsors and trading sites offer in funding compared to other industries. A snack sponsor gives max around 100k in sponsor money for a full year if you're lucky but 100k is not a lot when running a year-long high-end production circuit especially if you want to pay your staff fair wages like us.
1 matchday can easily round up to 2k-5k in wages (If you pay your staff) and a regular split in Challengers is a total of 24 matchdays which means 1 split can cost anywhere between 48k-120k now count as a second split and then a third split and then you realize this shit is expensive af to run and then you also have fans and teams expecting LAN finals, full studio production and all that which can easily drive up the cost of 1 split to 200k-300k AND THEN teams also expect an additional 5 Billion Dollars prize pool like that can suddenly appear out of the thin air
In CS meanwhile, unregulated gambling sites will just slap a 400k-800k cheque in your face and boom you got yourself a tournament with a 50-80k prize pool + potential LAN + a fuck ton of teams match-fixing + if you're lucky an actual profit from your tournament. The issue with this is the long-term funding though as governments are cracking down on gambling harder each year and CS has become less and less interesting for other brands to sponsor as your brand will be next to a random totally not russian bookmaker site who has been bankrupt for 5 years but is for some reason still running
Open System works in CS right now, but if that's the case in 5 years from now is uncertain tbh