Basically, Li thinks that a platform will need to make its revenues from value-added services rather than trading, which he sees as a basic service and a commodity that should be free for consumers.
What services are they selling? Let me guess, premium memberships that include a pause button to execute your trades before non-premium members?
Good question. Apart from "selling their clients' coins" of course.

Perhaps bitcoin lending (don't they do that already?). Priority in the placement of bids/asks (a subtler alternative to a "pause" button?
In my understanding, bitcoin as a currency of e-commerce or as a bona-fide financial instrument is dead in China, and I don't see that changing in the future.