Comment by objclxt

Because Tide is universally popular in the US, amazingly so. You could go into a CVS or Walgreens in the US and 70%+ of the detergent on sale will be Tide branded.

Since people are always going to wash clothes, retailers can guarantee they'll shift, and it's virtually un-perishable - and because the margins on tide are rather low, shops will happily buy suspect goods: they're practically untraceable and will shift fast.

Practically everyone does laundry, but not everyone drinks coffee. And those who do drink coffee will have differing tastes and far more varying brand loyalty than the detergent market.