If that were true, don’t you think the price of BTC today would be much higher than it really is? If elites (billionaires) really bought BTC, then it would be very visible on crypto exchanges that would be far less liquid than it is today - because I have not heard of a case where someone failed to buy BTC because there is a shortage on some exchange.
Regardless of the fact that the BTC supply is limited to 21 million coins, and that it seems very small to some people - there are still large (millions of coins) in the open market, but also in the OTC market.
Being rich and being elite is not always a sign that someone is intelligent, because there are those who have inherited wealth and do nothing with it except spend it. Consequently, I don’t think these elites took BTC seriously until the bull run in 2017 - nor did many ordinary people.