I think this project was the victim of some bad luck in terms of the exchanges. IIRC about the time mainnet was ready the feds had started cracking down on the exchanges so they cut way back on coin additions. Also since the crypto bubble they started charging an enormous amount to get listed. It's funny I remember when bittrex would list just about any shitcoin, and now I guess it's some great honor to get listed there
Cryptopia seems like a pretty good exchange.. and they list things with almost no volume at all. My guess is Bittrex then Binance in terms of difficulty. I think It's good that Semux was airdropped -- it makes it less likely to be called a security. Exchanges will like that, and it's unusual to have a coin this unique be airdropped. Many other coins that had ICOs could get delisted.
It would be cool if there could be something like a Stellar anchor with a website where you could deposit semux and withdraw semux tokens on the stellar network (for a small fee). Then you could trade the semux tokens on Stellar's DEX. The anchor acting as a semux on/off ramp for the DEX. Just an idea