Hello @vitaly-p2p
Did you check out simple failover setup:
The reason why other stake pools try to discourage this is because it may cause them to loose their produced blocks. If one of your forks gets propagated as a tip to another BP they may produce many block and have them all ghosted when their fork gets ghosted.
Check out previous debates about this issue:
So it’s not anti-network behavior as much as it is anti-peer behavior. This is why community will usually try to reach out to stake pool operators that are causing this.
Check out examples of notifications/ debates on Twitter about this issue:
If you like to learn more why dual BP are bad here is a very good YouTube video by Adam Westberg on dual leaders. He can explain it way better then I can 
