That’s true of some, not of others (for example, LuxTrading uses a well-known, well-regulated broker).
Also, what you say above isn’t true of the futures prop-firms, only of (some of) the CFD prop-firms.
It’s very easy to offer opinions which look like factual statements, and they can be terribly misleading to forum members.
No - that’s just wrong. Firstly, you’re only talking about the CFD ones, and secondly there are exceptions, even among those!