I recently asked the Chinese language forum on Bitcointalk.org about their use of trade platforms and bots and the people in the forum seem very skeptical of bitcoin trading in general especially at Chinese exchanges. I found this to be quite a surprise given the Chinese markets own bitcoin trading volume. The Chinese exchanges themselves report that their mobile platforms are very popular which is even more of a surprise.
I think algo trading in Bitcoin is a hobby for most and very few take it seriously beyond writing or customizing their own platform.
However there are more brokerage services opening to provide liquidity and trade impact minimization for professional financial services.
The biggest algo traders might be the Chinese exchanges themselves to support zero cost transactions.