I don't want to smash anyone dreams but you will not hit a btc block with nerdhash or axe.

Not with current network hashrate.

Honestly it's just throwing away money and the devices are useless for anything else.

You have bigger chance a lightning will hit your house and it will burn to the ground than  hitting a block with one of these small hashrate devices (toys).

People like delusion but this is the harsh truth. 

And for all those who say "but you can try mining and educate yourself how it works" i can only say you can do the same with any PC without spending money.