Now that Chinese Content Platforms Reportedly Exclude Live Streaming Features, this has caused the revenue decreased in those platforms. It is obvious that if you block gambling streaming, then those people won't use that platform if they were using it previously to watch those streams.
Also, the Chinese were very keen to block the illegal gambling platforms and they also block payments in millions from those gambling casinos.
Or they have been cracking youtube as well? And their internet is being censored in the beginning? So I wouldn't be surprised if for years they have been cracking down very hard on every gambling related streams already.
However, if you go out and play casinos all around the world, you will see a lot of Chinese on the floor, from baccarat table to slots game machines. So in reality, they can still play not just by watching youtube, but playing in real life casinos. Maybe they can just travel to Macao and then boom, easy access to casino. So I don't think it has negative effect on streamers per se, although Chinese market is big, I doubt that it can put a dent on gambling and streamers.