I see nothing wrong with that, Justin Sun only gives a warning so that in the future if there is a problem, tron platform is clean and not involved at all.
the second round was paused but I saw Oikos succeed in the first round.
There is nothing wrong if he wants to clarify the air and make the public understand there is no connection between Tron network and oikos but going as far as telling people he advice them to invest is way too far,
Ofcourse such warning will trigger some fear on investor's,
look at ethereum blockchain, have you ever heard Vitalik is hold responsible for all the scam projects in eth network?
The project dev team will bare the responsibility and not Justin even if anything goes wrong