People should be allowed to make mistakes and learn from them. What I propose is what I am doing right now, discussing the differences and consequences openly and honestly. Most of them will ignore this advice and still invest and maybe learn from these mistakes, but perhaps not. Others may likely repeat these choices over and over not understanding why the incentives are perverse and why these developers are driven to exit their risk. By discussing it earlier and repeating it than some may end up only repeating the same error the first time or not at all.
I know this is not an exciting or "cool" conversation and I may be coming off as a old protective grandpa , but it doesn't matter. Generally , I have even been telling people to not even invest in bitcoin and only buy it to use it. I can think of perhaps even one other currency that has some utility - monero on the dnm , but even than you may as well use btc securely. If people want to play around with DAPPs than cool , but right now they should be treating eth as highly experimental like bitcoin was before it was valued at anything and using some sort of testnet.