i have seen this difference a lot compared to small exchanges but what scares me is that small exchange that is just a virtual value they trick you so you can deposit on the exchange and forever forever you will lose your inherent assets.
We do have to be careful if we want to transfer our assets to small exchanges with the aim of arbitrating because of the high price difference, because it's true what you say fraud often happens here and it's just price manipulation or fake transactions.
If we find the price difference is high enough we have to research it first, moreover it is a large coin it is impossible for the price difference to be too high between exchanges with one another. Wrong decision, then our assets will be lost.