I agree with your opinion, there are too many crypto projects on the market and the majority of them have the same problem - no real use case. They might have cool blockchains, but if they are not being used by real people, such projects are useless.
This one of the main problem of crypto world there is alot of them and no one can stop them from spreading a lot of new altcoin are being created and no use at all. They are just full of promises and that's it is much better to avoid an ICOs since for sure they will just scam the investor.
And we all know that some of the altcoins are being deleted by exchange because they have no volume and just a pump and dump scheme.
That happens every time an economic bubble trend arises. Dot com is a prime example of how most of the projects that were created at that time were dead and only on paper. No clear roadmap and only promises, those things made an economic bubble and cryptocurrency is also a victim of this.
Honestly, I'm sure this case didn't only happen in the cryptocurrency now, it always happens around us, in other fields.