For crying out loud, wake up!  They are not "investment advisors".  They are commission salespeople.  Until they are definitively prohibited from flogging any financial product or service in which they have a direct or indirect interest, there will be no ethics.

And notice that I did not add a qualifier about it being OK so long as they disclose their interest.  They will find a way to weasel past that.  Absolute prohibition.

And by playing along using the polite euphemism "advisor" this author is enabling them.