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"Only invest what you can afford to lose"
Exactly, watching the movement of bitcoin way back 2016 it's totally far, investing to this kind of asset must possesses much patience for getting their return, your management of movement and predicting must be good.
It is not new why some are recommending bitcoin as investment but it is good for short term only. Like me I am just involving myself now to this tho I knew bitcoin long time ago. Now trying to invest.