The profit we got from selling Bitcoin is a capital gain, not passive income.

If you have to make analysis, making a plan when to buy, sell and re-buy Bitcoin, you're a trader which spent time for making money, not just sitting on your bed and you're still earn.

If you only rely on Bitcoin to fund your life, sooner or later you will lost all of your coins.

I consider staking is a passive income, if you invest in stock, dividend is the passive income.