Its True but can't agreed with whole statement cause long term investment in top altcoins, could also reasonable cause most of those always follow bitcoin rally but rest of altcoins could be risky for invest cause there's always chance to scam or turn into shitcoin in long run. Short time trade may profitable with altcoins but hype coins could be risky because sometimes they never come back on that position, from where you buy but you can do short trades if you can fit with those facts.