What makes altcoins trustworthy is simply trusting people to invest in them. Even now, it's been a long time since we can't guarantee that altcoins can be trusted. We can see from the many cases that have befallen altcoins in recent years.
Basically, being in altcoins is a very big risk and indeed it can be seen from the start because basically things like that are indeed risky, even with the words that the return is much bigger, altcoins are still very risky and you can't underestimate it because it's a fact like that.
Trust in altcoins I think in this case no one really believes for sure because what I see and feel right now is altcoins only as one of the actions where we take advantage of the momentum that exists from increases and decreases so in that case I don't think it's a problem about believing or not because the use of such things is not only based on trust but only looking for profit by looking at the conditions that occur for altcoins.