To me this is a very clear sign that something else is going on, in my opinion all of those websites are being pressured by governments and probably by banks to limit the exposure of icos, to me this seems like a desperate action they are trying to slow down the market, they do not want to market to grow even more and to attract the attention of even more people. They understand very clearly that if this trend continues they are going to be unable to stop cryptocurrencies so they are trying to buy time to figure out how to do it.