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In my opinion, I don't think they can force someone to invest in bitcoin or any other business, you should know that they have the interest to invest already. when you explain to them they will try to complain so that you can explain better for them, and when the market is bad, they can put the complaint on you, or probably you can give them some funds to recover. If you see they force someone to do something, they show him what will destroy his life, and he will obey and do the needful to protect himself, but with bitcoin, business, or trading, they can't force anyone to do it.
When we say you should never force a person to invest in bitcoin, we do not mean applying physical force to get the person to agree with you and invest, what we usually mean is, don't sweet talk anyone into investing in bitcoin simply because of what you said, it is always best to let anyone interested in investing in bitcoin or any other crypto currency know the actual risks involved, this will help them to make an informed decision that they themselves will be responsible for, so that they don't come back dragging you when things fail to go the way they had planned.
There are so many people who invest in bitcoin when they are not really ready, and such a person will want to sell his or her bitcoin at the slightest financial challenge they encounter, if at the time they want sell, the investment is a loss, without properly educating them of risks like this before hand, they will hold you responsible for the loss and this is bad.