What will happen if the team decides to delay their listing in exchange ? The same them will happen once they will be listing. I believe a possible solution will be completely avoiding listing in exchanges. This is what most scamming people are doing right now with many ICOs. Like you have mentioned it is a free market and anyone can do anything on their own money/coin/token and we cannot have any opinion on that.

When a  coin is new, I believe it will not be affecting the entire crypto market negatively in any ways. Because only dump of the major coin will be impacting other cryptos but not a new coin/token. Moreover, dumping or bumping will be giving big attention to the trading community when it will be happening. If the project is potential based then this kind of attention will be good for attracting new investors as most people are preferring to buy at dips.