No, but they reserve every right to stop you from doing anything with property that they own, i.e. the game servers.
But we cannot Alt+F4 the servers, nor task-kill the servers. But then, we don't use a server-based model either. We use a hybrid P2P model, where some data is exchanged centrally with the servers, but our primary interaction with each other is P2P based - which then raises another set of issues we haven't even discussed yet.
As the Administrator for my network, and the owner and operator of my network equipment, which includes the modems, routers, switches and hubs that form my network infrastructure, I do have the right to control the traffic coming in and going out of my network, and to review that traffic at any time I choose. Which means I can see if there is someone making a connection to me, and if I so choose, reject that traffic at the router level, which is off-limits for any 3rd party to monitor. So instead of a "Combat Log", traffic blocked in this manner would simply vanish from an instance, while still remaining connected to the central servers. And while I've never actually tested this, I suspect in a worst-case situation, might cause a "Matchmaking Server" error, however it is important to note that in this case, by restricting traffic, I have not made any alteration to the Elite software, I have only exercised my rights as a network administrator, to control the traffic to and from my own personal network.
And I do restrict some traffic - I do not accept any connections from North Korean addresses, either inbound or outbound. I do not accept traffic from Middle Eastern Countries or territories - inbound or outbound. And I limit traffic originating from China, Hong Kong, and Thailand. Of course, this is largely out of the scope of common consumer-grade network hardware, and the average user, but certainly can be done.
