Isn't it still bribery though?
Sorry, I've checked again and turned out I'm mistaken.
That bribery thing is just
a meme joke that's somehow got taken seriously for some.
The developer never promised players to give the primogems if they won.
They gave the primogems to celebrate the nomination, it doesn't matter whether they won or not.
What they said:
"Genshin Impact is nominated for the Best Ongoing category at The Game Awards 2023.
As a thank you for the community's support, Hoyoverse will reward Travelers with Primogems!
Check the news updates and how to claim the Free Primogem Rewards!"