Internal testing was originally introduced for the technical adjustment and improvement of game programs. There was no doubt about this in the early days, but now many companies like you said, like some Korean online games, don't need a particularly long internal test time to switch to the China market, because the game has been tested in Korea for a long time. However, it does not mean that all internal tests are for commercial plagiarism. There are many examples If an online game charges, the internal test time will not be long.

Also, finding bugs in the game is by no means nonsense. There is no bug-free program in the world, let alone games. Internal testing is to better improve the game.

Off-topic: It seems that World of Warcraft took two years to conduct internal testing. Senior two began to have news of internal testing. I didn't play public beta until I was a freshman, which made me lament the long time and the hard work of waiting. Of course, Blizzard's products are definitely no problem, so waiting for a favorite game is also a kind of enjoyment, hehe. I hope you can play healthy games.