The phrase is used metaphorically and doesn't involve real silverware. He didn't have to work hard; his connections offered success on a silver platter.
Pro Tip 2/3
Expectation vs. Effort
The phrase suggests an expectation of entitlement, without personal effort. She believes promotions should come to her on a silver platter, not realizing the hard work needed.
Pro Tip 3/3
Negative Connotation
Can imply laziness or undeserved privilege when someone gets things too easily. He's spoiled; everything's given to him on a silver platter.