Why do people pluralize company names?

Plurals, Possessives

I hear and see a lot of pluralization of company names.

Here are some examples.

Many people pluralize J.D. Power and Associates as “J.D. Powers” — as in, “They won the J.D. Powers award three times.”

Many people pluralize Barnes & Noble as “Barnes & Nobles” — as in, “Did you see that book at Barnes & Nobles?”

Many people pluralize Kroger as “Krogers” — as in, “I am going to Krogers. Do you need anything?”

And what sounds sometimes like a possessive-apostrophe-“s” is often written simply with an “s”, so I know that not everyone is trying to make the name into a possessive.