Coinhive have a bad reputation in many users and their mining script in most of the antivirus treat as a virus. I'm sure this is their plan to don't let other bloggers and users know about this so that they can still make money and run their funds.
Coinhive is banned in a google search engine and many antiviruses and website due to their browser mining script. So I think this is one of the reasons why they shutdown their website. And I am sure there is another new website come with the same feature and service offer.
Theres no other coinhive in the net so basically this is the thing he do mention about Coinhive. This is my first time hearing out that Monero is part of it.
Coinhive might be useful for some but talking generally this is a piece of crap script.Yes, it do gives out the chance to mine something out of your computing power
but it isnt really worth to let it run on your pc. There are lots of complaints about on this one and even my current anti-virus do detect it as a malware.