To show that you deserve whatever pay you need to show impact and complexity. I don't think you would have a problem showing either when talking about maintaining Google scale products...
Now we are talking. The thing is, only few work on those big projects. The rest are doing god knows what and have to jump ships often. If your resume says you spent 5 years maintaining a smallish noname project, your career is at risk. I don't believe that Google keeps all its 100k employees busy with complex and high impact projects.