You can avoid that by registering on the reputable exchanges such as binance, bittrex, poloniex, and don't use the unknown exchanges or the new exchanges because we don't know how good that exchange serves their members.
You can check the coins at coingecko or coinmarketcap to find where the coin is listed, so you can choose a reputable exchange to buy the coin.
We don't know who the person who buys the coin with big funds because if you check on the order queue, we don't know if that order is from one person or two people.
As long as you can buy on the reputable exchanges, you don't have to worry about scam because the reputable exchanges will always take care of their reputation.
You don't have to worry about the negative things because you can prevent that by always selecting the reputable exchange, and no need to be afraid.
You should remember that you don't need to use big money to buy the coin if you are not sure about the exchange.