This post on  Google’s venture capital arm  Google Ventures , summarises what  I have believed for long

Corporate venture capital, according to many, constricts innovation rather than foster it. I’m inclined to go with the view, particularly as speculationGoogle launching a venture capital arm called Google Ventures. The Mountain View, California-headquartered search giant has not yet confirmed these news reports. mounts again about

No matter how it is packaged, the venture investing model followed by the likes of Intel, Cisco Systems, Motorola and so on ultimately exists to serve one purpose — incubate external tech labs with the objective of either absorbing those emerging technologies within the larger company or to simply arrest the growth of a competitive technology

Many of these companies will go to any length to destroy a competitor , from spying on activities to dumping viruses and launching DDOS attacks.  So the less they know about you, the better.