You could also ask them to clarify what they mean.     It's easy to get a 5% return on a single day but it's also easy to lose that 5%.  What do they mean by easy?  (Is language an issue?)  Unless you outright state it's a ponzi, like OgNasty did, you cannot easily get that return "daily".  So they are being dishonest if they state luck is a matter of skill.     Maybe try a quick education campaign first, and then you'd have more support to enforce.  If they are promising fortunes by just plugging their preferred platform, then that is deception, and is not trustworthy behaviour.

People today are so easily hurt.  Why2why, a junior member with 49 posts, feels he has community equality with you and that you must treat him with the same respect you would give a Legendary.   He obviously does not, as we Legendaries have earned our positions through the trials and tribulations of our years.   And if one does not respect that rank, then why would one want to make a reputation here?

In this case, I think OP did the correct thing by asking for advice.   He's free to act either way, as it's just a neutral, but we all need to remember trust inflation - the more you leave, the less valuable they appear to others.