" The fact that the messaging app raised enough money already through their two private ICO rounds was cited as the reason for the decision."
cointelegraph don't say the true*. The real reason is that they don't wan't problem with the SEC because they don't sell any product. (their blockchain is not made, nothing is done, i'ts not really authorized to sell to the public a product that does not exist). As a precaution (and as they already raised $1.7 billion) they preferred to stop right now,
*
does cointelegraph ever done a real article?