I think a lot of domainers probably already do. Because there are usually only around 30 auctions a day. But it's hard to tell for sure. because we can't tell how many domains are won by DC with only 1 backorder.
My bottom feeding is usually for domains I don't think they want. I've been right more than wrong in the last 6 months. But I would say in the last month they have captured more of the domains which I have ordered elsewhere. I can't tell, but I suspect, because of my previous successes, it's my own assessment which has got more bold, rather than them grabbing more domains. But it's probably too small a sample to extrapolate from.
I am basically boycotting them. But I have backordered not many, but a few domains there which I think they would be interested in. Because, if you backorder a full price domain from them, they are precluded from going after that domain. This works. Just as long as nobody else has backordered the domain. But if there are 2 or more backorderers it goes to open auction, which invariably goes beyond my backorder budget.
I think 1 I won outright and three went to auction, where I was outbid. So a total of about 4 backorders with them. So not a 100% boycott, But almost.