Many beginners into the bitcoin world have probably "invested" in ponzi sites and lost some coins in the process.
How should veteran bitcoin users in the community do their part to alert beginners about ponzis?
This is very good idea but not realistic.
Beginners will always do things their own way, will not listen anybody and will make the same way as we did.
After that, they will become ''veterans'' and experienced users as we

young people don't have wisdom, patience and experience and wants to do everything in fast way, can't wait.
You can try to put some info in public forums and sizes but it's question if others will read and accept it.
It's always easier to believe in some crazy ponzi schemes and promises that to accept that there is no possible to get to rich over night without hard work and effort.
It's human nature, I guess.