It is, unfortunately.
Because it’s what the people betting against them want them to use, and have promoted accordingly.
One would think so, looking at it superficially.
I think it’s more complicated than that.
Using MT4 doesn’t help new traders at all, I think. Some of the indicators are unreliabIe, and it attracts them to EA;s, which the people betting against them love them to use, of course.
It’s your broker that’s disallowing that, not the platform.
I think it’s commonly a pip better than normal, actually: a 5-pip minimum is very common for EUR/USD.
This is all more or less a myth. Whoever you use will be a counterparty unless you open an account at IB, and however good you can become at scalping, they’ll find a way to stop you because it’ll be their money you’re taking, not the market’s money.
This is one of the reasons why scalping M1 charts is an unsuitable approach.