If someone is good enough to get a $1mm stock option package at Snap, then if you divide that by the 4 years that it takes to vest, the difference between taking a job at Snap and pulling in a big Google compensation package isn't too far off.
$1mm/4 = $250k per year - $Tax = something that RSUs at Google could have accomplished with far less risk.
The real life changing amounts of money are going to very few people in the org.