That thread is a very specific situation and is asked for a certain reason. And I would appreciate if you didn't mix my other threads with this one.
Yes. All of this is true, but technically that still isn't "slippage", per se (I acknowledge that I'm being slightly pedantic). Maybe - I don't know: it's going to depend on how you trade. For what it's worth, I think that if you're going to use a counterparty "broker" to trade spot forex, Oanda is about the best, and least dishonest one - so I'm certainly not trying to suggest that you're in the wrong place. (Even if some of their spreads are both a little larger and quite a lot more variable than they used to be.) Nobody suggested it is. What's immoral (and should be illegal) is being a counterparty market-maker but deliberately deceiving customers and potential customers by pretending to be a broker. Industries that don't regulate themselves adequately almost invariably end up having more and more external regulators with bigger and bigger teeth imposed on them by governments responding to public and consumer-group pressure, and that ends up being worse for everyone. The retail spot forex trading industry is a prime example of this societal phenomenon. And ironically enough the people who complain most about "nanny statism", when this inevitably happens, tend to be the very same people whose behavior caused the problems in the first place.