Long story short, phone charger blocks have a difficult job. It's not a 1:1 transfer or energy or even close. This causes heat. So, phone charger blocks can and often do melt down and/ or explode.

I personally knowing what I do now would not leave one plugged in at night after I went to sleep and wouldn't leave one plugged in if I left the house.

Clearly you can't extinguish flames if you're asleep or gone.

I was a little bit surprised by this but it's a fact.

In a similar way, a power strip does nothing to increase the power generated by the electrical outlet where it is plugged in.

So, if a power strip has for example 6 electrical outlets, you're still getting the available power of 1.

If there are technical specifications involved, but the bottom line is that apparently you can easily overload a power strip. If you do, it too can and they often do also melt down and/ or explode in flames.

I've stopped leaving my phone charger blocks plugged in unless I'm using them.

I'm considering turning my charging strips off when I leave the house.