I think it is safe to say that
BTC owner is someone who owns the keys. At the moment such person deposits ALL his
BTC's on an exchange, he delivers the possesion to the exchange. Whether he sells them immediately or waits for better price does not make him
BTC owner anymore. And if someone buys
BTC's but keeps them on an exchange he is also not an owner. These people are traders who don't care what they trade, only care for the profit. Therefore, the number of
BTC owners (real investors) is less than 28 mil. Provided that almost everyone has at least 2 addresses (and some more than 10), the real number is much smaller, probably below 14 mil. Compared with the Earth population and the 3 mil
BTC's left to be mined, it is clear that the mass adoption has only just begun.
You seem to have a perverted way of taking not your keys not your coins to an extreme, ivomm.
Of course, if custodians have bitcoin keys they can brute-forcedly fuck peeps out of their coins, whether by hook or by crook or by accident. But having a claim to coins rather than holding actual coins does not mean that those people with claims to coins are not bitcoin holders, even though they personally are not holding the keys.
Get real. Think about it. Don't be giving any license to coin custodians to believe that they own the coins under their control, and custodians still have fiduciary obligations, even if they get a lot of leeway in their legal rights and even their historical corrupt practices and abuse in that direction.
If people had absolutely no faith in institutions custodying their value (whether bitcoin or otherwise), we would have a lot of fucked up situations and likely be in a kind of stone age that lacks in finances and money and inferior systems that involve trading cows and chickens, etc etc.
So, anyhow, there may be some bitcoin wallets that custody the bitcoins of thousands or even millions of users, and of course, most exchanges are going to engage in some dividing of the assets under management, so institutions might also have some addresses that hold a large number of bitcoins and other wallets with smaller amounts of bitcoins and in the end, there are real people and real institutions that have valid and legit claims to those coins under management..even if their claim has legally (and reality) inferior status than the coin of someone who is actually holding his/her/its own coins and private keys.
In general I like your thinking except in cases like this, where you either didn't read carefully or write without thinking. But I am in a good mood, so I will explain the obvious.
-If you sell your coins, you are not an owner anymore. You once were, but the statistics cover only the addresses with a positive balance NOW, amInotRite?
-If you transfer most of your coins to an exchange but keep at least some dust in one of your addresses, then you are technically still an owner.
-If you transfer ALL of your coins to a personal address which is given by an exchange, you are technically not an owner, because there is a chance that the exchange or a hacker can scam you and you won't be able to withdraw it back. You heard about "Not your keys, not your coins" (MtGox hinted). BUT, I wasn't even talking about this case, because these addresses might be counted by this survey. I was referring to the last type:
-Finally, if you give ALL your coins to a friend, trust, OTC, whatever, and you don't have a personal address and ability to controll your bitcoins, then how the HELL you can claim you are an owner?!? You are a seller who is in process of selling, or shorting, or trading or whatever. The same applies for non physical futures trading. Why should we count those people as Bitcoin investors? They are like every other gambler who puts money on horses or whatever. No matter there might be millions of them. The point of this survey is to show the number of addresses hence people behind them (as an estimate), who are involved in real possesion of BTC at this particular moment. And this number is shockingly low <<
28 mil, which is a very good bullish sign, so let's not spoil it with nonsense verbiage anymore, mmmkey?