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can you say the same thing for any of the altcoins? not at all.
ETH that everybody praise, has Vitalik who dumped a massive load on the first pump and as soon as the dumping began and took out a couple of million dollars out. and that was only 25% of his personal stash.
the rest of the altcoins are the same. they are made with one thing in mind and that one thing is "how to make more money out of it".
and as long as this is the mentality, nobody in the market will treat altcoins more than a pump and dump.
To be honest you are right and 3/4 BTC are already mined so even mining is somehow centralized arround china then in terms of distribution is not. Altcoin were designed to make rich their creators mostly.
They often abandon project and move to new one BETTer once ICO/Premine money are over. things will be recycled later and sooner premined coins are going to be ones again going.
the tokens that are going to be profitable are those platforms like Burst, Nxt, eth and waves.