If you are referring to the otc model, then you can also say that every bank is running a scam which in essence what it is if you are not using a centralised exchange....
muliti-lateral trading facilities, dark pools, market makers paying for order routing to run their short term hft execution models. It doesnt stop robin hood or interactive brokers from using it. IG Index and cmc are no different.
It doesnt change the fact that IG index and cmc, the large size firms they are, you can complain to the financial ombudsman in the UK to file an execution complaint
The fact that you are quoting the articles from years ago shows your lack of knowledge.
Many profofessionals use these brokers to punt, they have direct market access on one screen and IG index on another... They know when the broker moves the market or widens the spread. But in order for IG index to maintain their business model, they need to be on market 99 percent of the time. There are traders who have million notional positions and some with 250.00 positions. If you are not successful in day trading indices at IG, you wont make money with micros either. But at least he gets access to every index in the world without paying data fees
You wouldnt know bc you dont have an account
For a newbie trader looking to learn his craft in small size, i stand by my recommendation