Few Examples: Litecoin is literally a clone of BTC with tweaked parameters. However it does have its use as sort of a testing ground for BTC (segwit for example). Plus it still has a figurehead in Charlie

When Grin was released, miners were ready and so it didn't really become a fair launch as all the heavy duty GPU people gobbled up the hashrate.

ETH: 70% premine.

As bitcoin was released during a time where there was no fanfare it had the time to establish and decentralize itself which no other coin can have. You could call it the "immaculate conception" of a blockchain that no other will ever be able to repeat.

This is just a few examples. It's almost as if every PoW coin that isn't bitcoin has its own reason for being rejected by maxis.