It is not a doubt that the leading problem faced in the alcoin/ICO investment is dumping. Seeing a token you invested into being traded at a drastically low price to the face value is highly pathetic.
What do you think the project developers can do to prevent the bad effects of dumping on investment?
The leading source of dumping is people that purchased during the private or presale at a substantial discount. The way to prevent that dumping is to require that they are subject to mandatory holding periods. ICO's don't want to do that because without that substantial discount and the ability to sell it as soon as it starts trading these people would not invest. As an investor you can avoid this by not investing in projects that offered large Private and PreSale discounts but without any hold period.