Red Dead Redemption 2 is a very slow game. The first chapters are almost entirely made up of long trips from one end of the map to the other, and the prologue generally lasts several hours. It turned out that PC-players are not very happy about it and do not use the fairest methods to skip the beginning of the game.
Red Dead Redemption 2 was released on PC almost a year after its release on PlayStation 4 and Xbox One. The release was darkened by a lot of problems, bugs, and errors, but even those who were able to launch the game decides to skip a huge piece of gameplay and story, using third-party mods and saves.
The page of the game in Nexus Mod is not yet full of modifications, but many of them allow you to skip the most boring parts of the game. This has a very logical explanation. As they say in the comments: many people have already played the game on consoles and just do not want to go through the intro and opening chapter again.