Bungie has been accused of lifting artwork four times now. Last year, an artist accused the studio of borrowing its designs for a Destiny 2 Nerf gun, which was amicably resolved.
In 2023, an artist pointed out the similarities between their artwork and a piece that appeared in a Destiny 2 cutscene. Bungie resolved this by compensating and crediting the artist.
In 2021, fan art was used in a trailer, which Bungie again resolved after reaching out to the artist in question.
Considering this is the third time they’ve been caught stealing art, I don’t believe it was the work of a former employee.
It’s been four times actually.
From https://www.gamesindustry.biz/bungie-confirms-marathon-uses-stolen-artwork-is-undertaking-thorough-review-of-in-game-assets