Not if they are unaware of how things might be elsewhere. If they have only ever worked at Google out of college they could have no idea that things suck.
It's hard to believe that people working in one of the most seek-ed/desired jobs in the Valley / tech world, are unaware of how things might be elsewhere.
People still work for Amazon, so we can be sure it is nevertheless true that some people don't know how good things could be for them.
what does attrition look like for Amazon vs Google?