Well for example I know someone that was able to get an O-1 visa on the basis of being the expert on a piece of technology because he had for years been a major

Well for example I know someone that was able to get an O-1 visa on the basis of being the expert on a piece of technology because he had for years been a major contributor to a business critical open source project. It's not enough to just point to github though, as your lawyer will tell you, you need prominent business people to vouch for your credentials. They are used to doing this though, if your company has the right connections.