I think ot is preposterous to say that altcoins are designed to scam investors. Not all altcoins are scams and some have great utility nd technology behind them. Examples are Monero and IOTA
It is really humorous to say altcoins are to scam because they are not we should not find altcoins bad even as a Bitcoin enthusiast because altcoins have become the necassary part of the crypto market by covering 40% of the market dominance at the current time.
With time investors will find it more profitable and the dominance will increase too. They are not here to scam but to give us more options when we are not doing well in bitcoin and the volatility is not high in bitcoin therefore profit can't be high too.