>what's the point of "getting in early"?
You're trying to make the point using BitCoin, but in the early 2000s I had just over 14,000 of them, so I can quite clearly see a point in getting in early.
The bitcoin white paper was released in 2008.
The argument about bitcoin was against it being "the future of currency". There is no point, whatsoever, to "getting in early" to that.
If everyone had been talking about it like the casino that it actually is, then sure - some people made some good bets, and a lot of people made bad ones trying to get in early. Imagine being the person who sold all your bitcoin for whatever other stupid memecoin, to "get in early"?
It's not a real counter-argument, it's just "I had a lot of dumb luck on this one specific thing, aren't you silly for not guessing as well as me".
(Assuming you meant early 2010s, since Bitcoin didn't exist in the early 2000s)
This underscores a main counter point: dipping your toes and casting a wide net often has a low cost, since back then you could mine (and even purchase) Bitcoin relatively inexpensively. If it hadn't worked out, then it wouldn't have hurt much at all.