Often it's the exact opposite: a way to brag and draw attention to things that people would otherwise not much care about or consider admirable.

Pretending to be humbled is basically lying about the amount of recognition you receive in the hopes that new people will be tricked to really consider you important. Perhaps similar to tagging everything with #blessed on instagram.

"I'm so humbled and honored and surprised to be/serve as X and I want to thank my parents / offer mentoring to the less fortunate of you" often after aggressive pursuit, self-nomination or unacknowledged massive help / connections to get whatever the thing was.