That's some stupid reason in my opinion. He claims "TRON is not associated with internet." The platform was built by him and he knew it from the beginning. Then he has problem with it now? That's not a valid reason. I see something else is going on.
What assurance do you even have that he is the main developer of the platform, because when we talk of the person that built the platform, we are talking of those who have the technical know how.
There is no way he alone can single handedly built the project, he Is just a business partner and if he wants to leave, he is free to do so, lets see how far he can go, I am very sure that no matter how, he can still never be as perfect as the original project they all developed together as team. It will still take him time for whatever project he is working on to get awareness while TRON continues to be properly maintained.