I am pretty sure that it is not the news of SEC which is causing these things to it. Lets face the thing that they are getting affected by some of other internal facts because SEC would killed the market already but ETH was down since the few month and it has not come up with the BTC rising too and hence it looks like that it is something related to platform issues and thus investors falling back from it. ETH did have the issue of scalability and thus might be the cause that loosing ICO or some kind like that. Over the time loosing everything , the value, the market cap too.