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.
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.
Yes, it can be correct because those who have been able to retain their investment since the present time have already been successful and they have already become long -term investors. But this may not have been done for everyone because at that time the price of Bitcoin was not high at that time, that is, at that time, no one has ever been so likely that Bitcoin can be so possible in the future. But they are investing in Bitcoin at the present time they already know about Bitcoin and believe that they are now investing in Bitcoin, even trying to invest in continuously.
Based on your example, we have read some investors in Google that were really impressive. I am mentioning the names of some investors who have invested Bitcoin for 25 years. For example,