Gold has the lowest amount possible out of all three in your comparison but easy to fake.
Real Estate has the highest amount possible out of all three and will always grow with a steady growth, someone always wants to buy and its getting fewer and fewer.
Bitcoin has the medium amount possible out of all three but you can't and assume the next 15 yrs growth because of the last 15 yrs.
That is why a lot of people regret from not buying Bitcoin earlier because of that assumption. Although we can't assure that what happens today can be the same in the future, that is faith and trust. Risk-takers don't choose to be safe but rather prefer to take more but look, these people are earning more compared to those who invest in nothing.
You are not necessarily risk taking for buying bitcoin. You are likely taking as much risk if you decide not to buy bitcoin, even though not buying bitcoin is the default move. Yeah, it can take a bit of time to actually figure out how to source your bitcoin and/or to get bitcoin price exposure... So then maybe getting price exposure is one level, and then taking bitcoin into self-custody is another level. there can be some learning involved in any of these matters, which might seem like risks when you are learning about something new and even investing might be new to someone who had not been previously investing, or maybe they are able to invest through their work 401k.. but not very many normies even have those kinds of retirement investment plans that they are able to invest into. So if they have never invested, then they have to figure it out. which might seem risky, even though it might be practical, since not investing tends to result in depreciation and devaluation of your purchasing power, so those who are not investing, might well be in a worse (and/or riskier) position than those who are figuring out ways to invest.
Some people sell their gold for Bitcoin.
Some people sell their valuable properties for Bitcoin including land.
There is only one reason of these things --Bitcoin is the majority choice by most because of its growing price trend.
People are figuring out bitcoin to be a good place to allocate value, but they still have to figure out how to do it and maybe how to do it in a way that is reasonable to their own situation... but yeah, we are still early, even though more and more people are learning about bitcoin and even coming to realize that it is better than they act, rather than failing to act, when it comes to getting bitcoin exposure and/or even self-custody of it as a possible next step.