During startup, the JVM initially reserved the full 1000mb (making the address range 0x10180000 to 0x4e980000 unavailable) and then committed just what it needed to get started, in this case 4mb.

Averages can include data for service startup or other events that might cause the Numbers to go far out of range for a brief period, thereby skewing results.

You can see people in your network who are initiating new startups by doing an advanced search for a range of keywords such as “stealth” or “new startup.”