Short term investment is a good investment also.as long as your investment are profitable.but this short term investment are very risky.we dont dont if your investment are become profitable or it will make you bankcrupt.
I think it will become risk if you invest in any investment site which is ponzi schemes and not the bankcrupt reason thats why you have doubt on it i suggest to stop investing in any site cause there's a lot of scammer that making clone investmet site. For me much better to invest in ico sites which is classified and legit ..and i know that some of the legit ICO site has a funds for the return . .any ways i am agree on that short term investment but if i were you if i want to earn more profite in investing i will choose long term cause there's a chance that we will become profitable when the bitcoin rocketed to the moon .