Why do men use women’s shampoo ?

I am intrigued to find out why men use whatever shampoo is in the shower ?when it can be a shampoo specifically made for women’s bleached or dyed hair which often contain heavy oils for conditioning over dried out hair that’s been overprocessed /heated
Is it just a lack of interest and can’t be bothered ? it’s just shampoo after all ? Or lack of knowledge about what’s good for men’s hair? Or they don’t know what’s available ?
Or all the above !
What you think?