That's understandable. Many projects are not worth a cent. During the hyip began the emergence of a huge number of meaningless projects. Time will kill them.
as far as I know, not all of the coins until now are worth zero. because until now altcoin is still standing and used by many people even though there are many problems that always occur in altcoin so far.
The last part is true, most altcoins have huge problems because they were only issued for the sake of issuing another altcoin. While I agree to your last part, the previous part of your comment is totally contradictionary. 95% of all Altcoins are dead more or less in my opinion.
Why do you have the assumption that "altcoin is still standing and used by many people"?