Short answer: we're not at the point where IPO would make sense.
Long answer: We see ICO as a means to build community while raising venture funding. IPO, on the other hand, is frequently used for initial investors, particularly VCs, to exit. Moreover, IPO can be overwhelmingly lengthy and expensive. It certainly is not suitable for us.
If you meant STO, please refer to the ICO series published by our CEO, Dr Jiulin Teng, for our view on the tradeoffs: