4) Lets say I have a trading bot (in betting or crypto exchange) and this bot goes wild due to misprogramming and I lose loads of money. Are all these users filling my orders scammers, when it's obvious that these prices are wrong ?
This seems to be a good place to start out (you should have probably made it #1 item in the list)
It is obvious that traders filling your orders are unaware of the fact that your bot went nuts. Moreover, they themselves may be using bots. In this way, you can't call them scammers or cheaters. And even if it looks like something went totally wrong on your side, there is no certainty of that. To sum it up, in trading the answer is pretty straightforward. You can call scammers those people who are filling your allegedly wrong orders as there's no knowing
Indeed, it is more complicated with casinos as little doubt arises when something is totally off, e.g. when you start winning all of a sudden and that is definitely not due to a streak of luck. With that in mind, there are two major choices. If you consider the casino in point as a legit and honest one, then exploiting the bug will be cheating (I don't think scamming is an appropriate term here). However, if they are themselves scammers (e.g. refuse to pay out jackpots or anything to that tune), then cheating on them can be morally justified (as I see it)