My thoughts are people should buy/ sell at a price they are comfortable with on a platform they trust.

If the choice is between two platforms, I'd advise going with the one that would give the better return. The fact is, no-one knows what the person on the other side of the trades intention is, so their is no point second guessing.

Blocktrades or whoever you buy or sell to OTC may opt to pump or dump on the market (for whatever reason) and they are entitled to. It's their money afterall.

My job is to know what my strategy is and execute it. Simple.

As you state, the "free market" will ultimately decide regardless. The free market includes those that are day trading, swing trading and attempting to manipulate the market. Let the buyers (and sellers) beware!