With 3.3 volts unsure driving

I had bought the ticket for my Raspberry Pi, and realized that the 3.3 volts are not sufficient to drive the relay safe. On some broadcast channels as it gets, in others. The tiny transistors to switch the relays are not in saturation, allowing them to be destroyed during fast due to overheating. You can remedy this by bridging the LEDs because they are connected in series with optocouplers.

I wonder also, why ever since the optocoupler in there because the ground on both sides have in common. A galvanic separation to the operating voltage of the relay is thus not present. All in all, a poorly designed circuit that is offered there en masse and cheaply. The same goes for the board design. It is incomprehensible to me why the two blocks with terminals are not in the same grid. This and other factors mean that there is no really suitable housing can be found. It's a pity, "Think before you produce" would have been nice.