"Quietly," like in "has quietly become the biggest/best X" is silly and everywhere, but "quietly" in this sense of "they didn't announce it and people just happened to notice the change" is fine and descriptive I would say.

Biggest LLM giveaway these days

Win11 has come up short,

So 10 needs more support.

How do they offer it, according to AI?

Quietly,

quietly,

quiet... L-Y!