Are you trolling? Most masternodes are hosted on centralized servers online, such as Amazon. The government can easily subpoena Amazon or simply forcefully take control of the server the masternodes are hosted on.
You dont seriously need a explanation for something this mediocre do you...
dude we went through this in quite a lot of detail back up the thread.....look at my MN distribution post and the subsequent debate.
Ok I wont respond to him anymore.
since taking down a coin's anonymity with masternodes like Dash is far more easier than taking down a coin that doesn't use masternodes like Monero.. Thats it. If a scenario came where the government was banning all use of cryptocurrencies etc, you can expect masternodes on coins to be one of the first things taken down by the government.
OK so Monero lives on longer than DASH in the face of Guv/TLA, is that your point?
Aside from this Guv scenario, as I said, the real-world fit-for-purose debate is surely around lesser adversaries. In this case DASH is fit-for-purpose IMO. On with adoption!

The challenge of finding the nodes? The ip's of all masternodes are in the open.
OK fair comment.....is it possible to obtain monero node IPs?
Hmm, I'm not completely sure about that. Probably, if you can its the same as obtaining the ip of a bitcoin node, you cant do anything with it though if you control the node(no spying or anything), so I dont see how it would matter.