Yeah it's disgusting and annoying as hell. 100% a bot because it instantly removes orders and places them again based on the price differences, 0 delay.

Right now as of posting, the current tops are
BUY 2751 x 42 SELL 2871 x 39

When I undercut the sell order by 1, it undercuts me 20 seconds later, and when I remove the order, it goes back to what it was 10 seconds later (1 under the next sell order) .
When I overcut the buy from 2751 to 2770 on the buy, 6 seconds later, it 1 upped me and placed an order with the same quantity at 2771 and 20 seconds later it went back down to 2751 when I remove it (1 under the next buy order) .

This seems to be a random timing thing they put in place, probably not to get flagged, but it has a range of (5-20 seconds) for each action it seems.

There is also a range where it's willing to 1 up, if it exceeds it, i.e. if the opposite sides "Profit" margin doesn't meet it's standards, then it starts to instantly remove orders on the opposite sides, and I mean instantly.
The moment I register that my order is in the public list, the opposite one is gone.

For example, As soon as I put a buy for 2780 [up from the 2751] (120 crown difference between BUY and SELL) , the 2871 x 39 sell disappears.

Like, Instantly. I did this over and over putting a 1x buy order for 2780 and the exact instant I placed it the 2871 x 39 disappeared, and when I cancelled it, it reappeared.
Like no delay at all, it's insane.

Similarly, if you put a 2800 sell order, the 2751 x 42 on the buy side instantly disappears. This seems to be some sort of protection put in place.