If Bitcoin price pumps from $1300 to $3000 in few hours, nobody would make profit from it, because the exchanges wouldn't allow you to sell your Bitcoins and make the fast profit, it would bring a big loss for exchange sites.
Do you agree with this?
I didn't know what will happen, but I think it can be a possibility. I think they will be waiting for hours or maybe days before they can allow someone to sell it. But, if you can't sell it, maybe you can convert it. I am using a coins.ph wallet where we can convert bitcoin into fiat in a second, so I think if they did not allow me to do a cash out, I will be converting that bitcoin into fiat. And after a dump, I will be converting it again to bitcoin.
market will not prevent any transactions if there are no serious internal problems, so there's no prohibition if large pumps occur within a certain time range, this is called liquidity. We can monitor trends and charts regularly every day, so do not wait to see when whales make the most of the trend, and we can benefit from whatever happens.