I had the guI. I tried dragging the game in, but it was too big, so I installed GitHub lfs to put the game in. Why do you have to type in a bunch of stuff to use lfs and put files in github?
The reason that you have to do all of that stuff is that it lets you have a bunch of people working on the same stuff, and it handles everything for you. I mean like, you can have dozens of people, hundreds even, working on the same project and same files, and it all works. As long as you follow its guidelines.
There is a bit of a learning curve. But it's not a filesharing service, that might be your confusion.