This is the good thing about CAKE as you described it, it is already an integral part of a major ecosystem, if not the major ecosystem right now. There seems to be no limit to Binance's growth when you look at their investment endeavors and research and development expenditures. CAKE is part of that system and so will also benefit from any move that Binance does. However, there can be unlimited DEXes launched on BSC so they do have some competition already.