Hmmm off hand I think this would be good for EU, but I’m puzzled why China Government would stop its citizens from making / pulling in money from other countries. Hell they are making a profit and bring more money into the country ; at least the way I see it.
Seems the government is ok with people making money from games but wants them to only spend and use that money in the game; sounds like a perfect match for EU?
No, not really. Most "gold seller" companies are located outisde of china. That being said, most people who profit from gold selling are the companies. These companies only have people who live in china and do the work, but the majority of the profits goes to the company.
A chinese goldfarmer works like 12 hours/days for 80 EUR (in a month!!!). However, for 80 EUR you get like 10.000 World of Warcraft Gold. And this isn't really much. For example a good Mount or item costs 15.000 gold. Some guilds are charing 30.000 Gold to leech people through hard mode instances for meta-achievement (where you get a very fast flying drake as reward).
And a chinese Farmers can do like 5.000-10.000 golds a day (depending if he finds valuable stuff or sales go well). Even an average player who only plays 3-4 hours daily (and do not have to do high-end raid 5 hours every day), can do 1.000-2.000 gold a day, even more (depending on his profession).
That being said, everyone with 2 brain cells can see, that 95% of all money made from farming is not going to china. Even though 80 EUR are enough money to survive for 1 month in china, it's not much compared to the "value" of the chinese workers work. If the chinese would sell the gold by themselves, they could get like 300-800 EUR/months, which is REALLY much money in china. But this is not the case. Chinese are (as usual) threated as slaves by the western countries.
So the ban of the illegal gold selling is probably to preserve this kind of money loss (read: make other countries rich). If only official money exchanges (run by the publishers of that game or plattform is allowed, which is the case and OP's source is simply bad and wrong), then only companies located in china are allowed to exchange the currency to the chinese there. And since the publishers for chinese MMOs are/have to be located in china, they can be taxed for selling virtual currency.
One thing most people don't know, some goldfarmers even advertise in chinese games themselves. Who ever tried the Aion Chinese Beta, would noticed that there was as much gold spam advertising ingame, as there is in other western games (Lineage II, WoW, etc.). This is additionally not possible anymore neither and the goverment can tax it much better.