With 15 years of experience, they can surely provide non-professional or semi-professional financial advice to others. They can even give professional advice too if they are that deeply involved with Bitcoin. But the thing is, they prefer not to do it if they haven't chosen it as a profession. The crypto market is very risky and uncertain. No one knows for sure what it might do in the next few hours. So giving advice to the mass people could lead to a very nasty situation if things don't work out the way it was predicted.

You can give the best suggestion or advice that you possibly can and you have the trust that it will work out in the end. But how many of the people you gave the advice will stick to the strategy till the end?

I think this is why even after having all this knowledge, they don't come forward to teach people.