
If you had encouraged some people to invest and then they lost their money along with your investment then it’s not a problem and you are not responsible for their investment or loss.
A person doesn’t become responsible merely by encouraging someone unless he took full responsibility of protection etc., in essence people should clarify themselves after encouraging people that they are only encouraging and nothing else.
Even though you didn’t abide by the principles but you would not be liable because what is worst than that is that you dealt with someone without any writing. These types of issues come a lot in businesses but you are not responsible for them and you can go to hajj.