The thing that makes me laugh is how they try to make it sound like they have all the rights for the server.
They say it's no "Pirated copy", and there are restictions like you can only install it on one server,
you are only allowed to have a set numbers of accounts.
And they see it as an "emulator".
But that's the google translator,
but I have found it to be quite useful sometimes,
not that good on the grammar, but good enough.
I really hope noone purchases their services.
Not that hard to google after "Mangos",
second answer from google is to getmangos.eu.
And I really hope,
if blizzard takes any actions against those sites,
Mangos does not suffer from it.
But from what I understand,
they try to make it sound like they have been given the rights to sell it from mgcore.com,
and mgcore.com compiles the source from git, and supplies dbc and map files with that.
Damn, I have really learned a lot today. Didn't even know mgcore.com or similar existed.
It's like I googled myself into knowledge, again...