That's a transaction a customer sent to me - it wasn't me that sent it.
I know the 100-per-hour transaction limit of ViaBTC fills up very quickly - I have tried like 10 times already, ALWAYS on the hour, ALWAYS in the very first second of a new hour ( I have made sure my clock is synced properly ) and I literally watch the clock hit the 12 mark and press "Accelerate" - always getting the "Submissions are beyond limit" bullshit.
Never had that happen before, and I've used them numerous times. Yes, if I am like 5 seconds late, it's already filled, but that's normal, I guess.
I also try yesterday few times and it is not working no matter how accurate I try to be in submiting transaction.So maybe they temporarily shut down free accelerator or someone found the way to take advantage of all the possible accelerations available every hour,maybe with some script or something like that.
Considering how big problems users have with high fees and stucked transaction,for some users such service become a lucrative business.