Scam is what has been in existence right before the introduction of bitcoin im cryptocurrency, am mot arguing that other cryptocurrencies does not have scam attempt but bitcoin is not a scam currency, those that will adopt bitcoin will do so with or without scam and majority of what we call scam were as a result of our vulnerability in securing our bitcoin through our own negligence or when we rely on exchanges to have in custody our entire investment with them.
This may not be possible because we are talking about a decentralized network here and everyone has the right to choose what to invest, invent or where to hold his investment, if you think third party crypto projects aren't good enough, stay away, if you think holding bitcoin on exchanges is risky, then have your cold storage and keep your keys safe or get a hardware wallet, you can also download the bitcoin node software bitcoincore and run a node transaction for maximum security.
This also is not possible as everyone will be responsible for his or her own project, those projects are centralized while bitcoin decentralized.