Because why not?
The chicks were five weeks old.
These chickens are just like, whaaaat?
There's lots of different breeds of baby chicks, and I want them all in my Easter basket. If only they would never grow up into nasty adult chickens.
Here, just take my money. Prevailing theories on YouTube are either A) the sellers are dying the baby chicks or B) the sellers are genetic engineers injecting food dye into chicken embryos to change the color.