There are some ways to make concrete anti-slip:

https://theconstructor.org/practical-guide/how-to-make-a-con...

Cheap, can pressure wash, if you make the appropriate grooving to allow thermal expansion it will last, but is easy to repair anyway. Can dye with any color you want too.

If you want an environmental-friendly alternative, you can do the same with clay mixed with some binder.

Pressure washing indoors would probably make a big mess of a grocery store though. Grocery store floors are chosen to be flat and impermeable to make spills easy to clean, but flat and impermeable tends to mean slippery when wet.

Perhaps linoleum (https://en.wikipedia.org/wiki/Linoleum) or some newer material with similar properties? I've used older showers with linoleum floor and it was not slippery at all.

Dunno, not an expert in this area, but even so, using polished tiles should be obviously a bad idea to anyone stopping to think about something more than looks.

Concrete, coarse finish