If we ban or forbid anything new than all of this has no meaning!
So bitcoin is a ponzi scheme as many said last years... or people just need to use they brains and invest their money more carefully.

Why we see everyday few new coins?
As I said year ago, cryptocurrencies is developing technology so many people try to take some advantage from it. Of course there are so many scammers, liars, fraud... because lot of people start mining/trading whit idea that they will make some great money in short time.  Sorry but you need to be genius or one of million lucky person.

Also, how you figure out when coin scam? Premine? Dev? Pump/dump?

How can you know what was intension of developer/s?
Ok, there are some obvious cases, but there are many coins whit new ideas(algorithms, psychology factors, usage, combinations with other technologies, etc).
We need to give a chance to every new hope.
The point of bitcoin and cryptocoins, in my mind, is that we are changing our perception of money in general.
I think that if all of this goes well some next generations will have less greed.
Utopia?

It is not the point to get there, but to have intension for it!