Why does it cost to build Minecraft Server?
Because neither electricity nor hardware or software is free.
First it costs nothing. You only need a computer that has the necessary requirements. Of course, you have to take care of the operation of the system.
But nitrado and co costs
A server costs money
You can also host an MC server on your PC yourself.
No, you can also host yourself.
The server software is still free or when you buy the game already there. So you can still run the server on your own PC.
The server version of Minecraft is free…
Only the hosters want money for the hosts and electricity costs etc…