This doesn't work if the peripheral manufacturers are themselves big players (which they are): they can already afford fighting to secure a place in the oligarc

This doesn't work if the peripheral manufacturers are themselves big players (which they are): they can already afford fighting to secure a place in the oligarchy of big players and it's not in their interest to open up space for direct competitors. Whenever you become big enough, you start to share some substantial interest with any other big company: the one of not allowing smaller producers to step in.