What I can tell is that all sites will follow the same path (90%-100% lost of value) if decided to call for an ICO pledged to USD value with a token and then get it listed on some random exchanges, it is likely that the coin/token value will drop immediately, mainly because of the owner will likely dump the remaining of his unsold token to the public via these random exchanges. It only legit if any how there is an exact model of real life IPO/ Public offering to be carried over and apply to crypto and it denomination/minium price will alway be valuated against BTC, as well as there will aways be a full buy back commitment after a certain period of time (at least any investor can have his stake buy back fully at wish with original committed price).