You can sell anything and make money out of it even if it's just an idea and am sure lot of people made money in that way but Bitcoin is just money so you need to be precise with what you are going to do with Bitcoin to raise funds. If you simply say give your money which I can invest and give portion from the returns isn't a real idea, it has to be something unique to convince someone to trust their money can be invested.
Choosing to sell anything to make money can of course be done by anyone, but they must first understand well what they are selling and by choosing to invest in Bitcoin, of course we will be able to make a profit if we can collect and hold it for a period of time. old thing, I think it would be very risky if we advised other people to invest in Bitcoin and it would be better to first explain it to them in detail so they can understand well so as not to make mistakes that cause them to suffer losses on the investment they make, because if we continuing to invite them to invest and they experience losses of course this will make them blame us for inviting them to invest and it would be better for us not to advise anyone to invest if they cannot explain investment well.