It's not just MMs, it's up to retail make things truly liquid, MMs just fill in the rest. You don't like the spread? Put in a higher bid. ;) 39 x 40 now and some typical bullish consolidation going on, but overall I love the strength that continues to grow.
While the huge blocks were sitting at .34 and the bid/ask was .33 x .34 there were people all day long slipping in with fractions of a cent playing with it. I saw plenty of times where some would slip in to make it .331x.339
I suspect once we settle here, or whatever price it is, we'll see the same again until the next move higher.