Are you really accurate with your year of reference mate?
Of course those that invested into Bitcoin at 2010 have invested into it for 15 cool years and are already long-term investors and can possibly live off their investments.
Yes, that may be true because those who have been able to hold onto their investments since 2010 until now they undoubtedly can already be a long-term investor. But this task may not have been possible for everyone because no one at that time ever thought that Bitcoin could have such potential in the future. But those who are currently investing already know and believe in the potential of Bitcoin, which is why they are now constantly investing in Bitcoin, they have even made various efforts to continue investing uninterruptedly.
Let's suppose someone who invested as little as $500 into Bitcoin as at may 2010 when Bitcoin was $0.01 or less, that person must have accumulated a whooping 50,000 BTC currently valued at $4.8bn, of course if that person have been holding since 2010 and never sold, then he should have every right to take profits and even live off his Bitcoin investments. It's quite a great fortune he's amased for himself.
Based on your example, we have read about the success of some investors in Google that were truly impressive. Among them, I am mentioning the names of some investors who have invested in Bitcoin since 2010. For example,
In 2010, he invested $3,000. With the price of bitcoin only US 15 cents at the time, that means he had almost 20,000 bitcoin. “I knew from the very start that I was playing the long game. I wanted to see how high it could go,” he said.
Mr Smith had almost forgotten about his investment 3 years later, when it popped up in the news. With the price rising by 10% or more every single day, he sold 2,000 coins when the price hit $350.
https://www.cointree.com/learn/bitcoin-success-stories/