Steam functions as an OpenID provider, so external vendors could (theoretically) use Steam logins for their platforms. The problem with "competing platforms" i

Steam functions as an OpenID provider, so external vendors could (theoretically) use Steam logins for their platforms. The problem with "competing platforms" is that they're mostly not competing platforms. Recently Metro: Exodus was pulled from Steam store to be sold as an exclusive on the epic store. This is not competition, this is a monopoly on distribution of a title. When different platforms emerge where most platforms have most titles (or offer DRM free like GoG or Humble Bundle), then we will have actual competition.