The propaganda camping on reddit against Hosp was very vicious, some where questioning if he was even a real doctor. Btw, I haven't done the research on that so I have no idea myself, I just assumed he wouldn't lie about something like that.

Even if he was deeply involved with some MLM card program in the past, I don't see how this puts into question the viability of the TenX project.

People are already using their app and the card! If TenX didn't have a working product, this smear campaign would be far more effective, but in its current state the project seems solid.