People who think that Bitcoin is a scam are a small minority. Even your example Warren Buffet actually thinks that Bitcoin is a bad investment because it can't be fundamentally analyzed like he used to with stocks. He no longer says that it's a ponzi scheme.
It's true that Bitcoin isn't very popular and most people don't want to invest in it or use it as a currency, but it's for other reasons like volatility and being hard to use. If many people believed that Bitcoin is a scam, they would more vocal against it, calling to ban it, for example. We don't see this happening.
i do agree with this guy
for the thread starter
bro every single think have pros and cons, i mean yeah there's people outside that talk not just bitcoin, all crypto is scam especially people who are first try the bitcoin and scammed before, whenever is scammed from friend hyip program etc. Or the people who likely just follow the trend without knowing more. In my country itself there is dozen of hoax news(*not crypto news) and there's some people still trust it.
and one or two people who's not know about the technology much, his barely cant operate his phone well. and you tell them about revolutionary "cryptocurrency" the first thougt come to his mind is the coin are not real they are not exist i can't touch it in real world. But people will change his mind when you give them reall money made from the crypto it self. Trust me
this actually happen in my family member my dad my mom can't even operate the android
my brother too
but after i made small profit from this they are believe
so IMO if you want to tell someone about crypto you must tell them how they work, and show ur result/proof, it can be phone that are you buying with bitcoin,bills you'r pay with bitcoin or the money you can generate at monthly basis. Thats it.People will more trust about it.