Or maybe viaBTC is pushing for their paid and premium services right now?
Because I also can't get any free submissions as it is always full no matter what the time is or wait till :59 and put your transaction ID. Or just like what the rest of you guys think, it's not a haven of bot as well, taking advantage of the free services.
Last time that I got mine is like around December 20k'ish and after that, no more free slots.