I think they were acquired by Canva so maybe they couldn't themselves find one. Please don't take it wrong. I mean it in the right way. They had built a platform for hobbyists to upload pics and medium users and many other bloggers started using it. But it always was like how'd they make money. Hope they have good home at Canva

Was wondering the same thing myself, found this article from late last year: https://techcrunch.com/2019/12/10/unsplash-for-brands/

TLDR: "working with companies to create branded photos, which will then appear on desirable searches."