how safe is Nostalrius Server ?

Hey 
I have a question now,
in the last years there was a big pool of privat server but so many was closed by blizzard. and my motivation break is when iam put so many time in leveling and more in Nostalrius and after 1 year this server is going down

I have a question now,
in the last years there was a big pool of privat server but so many was closed by blizzard. and my motivation break is when iam put so many time in leveling and more in Nostalrius and after 1 year this server is going down
