It's a global network, do with it what you want. 
If you open your door to others, you welcome more people with bad intentions too....
Still you can use it for your purposes.
Just dyor and stop answering the bad people (imho)

TCP/IP isn't good or bad. It's layer 8 (the human) where things start to get bad and malicious 

#Bitcoin is a protocol, not good or bad by design.
A car is a vehicle, not good or bad by design.
A gun is a tool, not good or bad by design.