Some coins like BITS make a good use for the giveaway specially if its documented, it can be used for charity giveaways and coders, not a bad thing.
Sadly its hard to trust a lot of coins you have no idea if it goes to devlopment or if they will get ride of it if they make it on a exchange.
Best thing to do is launch it at a certain time, and make it open for everyone. Look at how litecoin launched that is a good example of a fair launch.