It is likely because it is black and white. This appear to be one converted from color to black and white.
Please read the following info for more details
I hope you found this helpful
Yes, but it is SO much nicer in this converted sepia/cream tone! Thank you.
Sorry to destroy your illusions, but stock photography is not about nice pictures. It’s about what the customer needs. If the customer needs to turn your flower into sepia, he will do easily, but he cannot bring back the colours.
As flower images are abundant in Adobe stock, your picture needs to meet the wow factor to get accepted. Flowers and pets are probably the most entered subjects here, so Adobe has the choice to be selective.