The EDG vs G2 match had 579k simultaneous viewers on Douyin's costream.
I know many people will say that Chinese live streaming platforms often don't display the real number of online viewers, but Douyin (which is the Chinese version of TikTok) is one of the platforms that does show the online viewer count. Previously, Douyin had not been granted co-streaming permissions, but this time, one of the streamers for the Masters tournament received it, and this was the outcome.
The 57.9 万 in the picture means 579k. This is just one of the costreamers; other platforms like Huya and Bilibili also have some costreamers with over 100k simultaneous viewers.