the wiring and the standard they are built to are for small amperage loads connected to each receptacle. Daisy chaining them concentrates the loading to one receptacle which is not designed for the concentrated load. The device as a whole is often protected against over current; but each receptacle is not, being considered a tap.
Suppose someone plugs in a kilowatt space heater in one of the outlets, and nothing in the others. Its circuit breaker would allow the current, but would the individual outlet be overloaded? Essentially the strip closest to the power source in a daisy chain would see a similar effect, lots of cuurrent in one outlet, light loading on the others. I would avoid daisy chaining because of all the voltage drop losses incurred from all those outlet/plug connections. Similar to those office cubicle wiring systems with all the jumpers and sockets. We had one burn badly out years ago. The company had an electrician replace all that with a new conduit system attached to the cubicle walls.
