Thank you for your answer !
For the question to explain:
1. Disrupt the network means to take advantage of the control of the network, by any way possible. Make money, prevent peers to make money... What is it possible to do if we have the control of the network?
2. Steal money yes and no, the question is related to the question with the control of the network, if we can control the network (and by that I mean breaking connections between peers) is it possible to make (by any way) or steal money from the peers/from the network (which then we can control).
If you can fool someone into running a fake version of the bitcoin software instead of a version that follows the rules of the real protocol, then you can trick them into believing that they have received a bitcoin transaction from you even though they really haven't.
You could then offer to send bitcoins in exchange for things of value (such as cash, gold, or electronics). By the time the victim realizes that you have not really sent them bitcoins, you will have stolen the items. This is of course fraud, and theft, so if you can be identified you will be prosecuted.
If you have complete control over all connections between nodes, then you can split the network isolating your victim to a subset of the network where the total hash power of all the miners on that portion of the network is less than 50% of the total hash power across the entire network. You could then simultaneously broadcast a transaction on the subnetwork with you victim that pays them some bitcoins in exchange for something of value AND broadcast a transaction that spends at least 1 of the same inputs and sends the bitcoins to an address that you control. The victim's subnetwork will build up confirmations slowly, and when it reaches enough confirmations, your victim will provide you with the thing of value that you have "purchased". Meanwhile the larger subnetwork with most of the hash power will build up confirmations rapidly and will exceed the number of blocks solved by the victims subnetwork. Once you have the thing of value, you can allow the two networks to communicate with each other again. The transaction that you broadcast on the larger subnetwork will make the transaction on the smaller subnetwork invalid. The bitcoins will vanish from the victims wallet, and you will have your bitcoins back. is is of course fraud, and theft, so if you can be identified you will be prosecuted. Additionally, there is a reasonable chance that those who are on your victim's subnetwork will realize that the network has been split and that they are unable to communicate with many nodes. If you victim realizes this, they may not be willing to provide the thing of value.
Controlling the network doesn't allow you to create money, and it doesn't allow you to spend someone else's bitcoins. All it allows you to do is to control which transactions and blocks the victim sees and doesn't see.
Controlling more hash power than the entire combined hash power of the rest of the network allows you to mine all the new blocks (and therefore receive all newly created bitcoins) for as long as you can maintain that majority.
