Update: At the moment, it shows "19 remaining FREE". But when I try, I get "Submissions are beyond limit. Please try later." And when I reload the page, it still shows 19. So it doesn't work anymore.
ViaBTC didn't mine any block between 00:00 and 09:05 UTC and I think they stopped accepting new transactions once they reached a certain size of transactions waiting to be mined freely.
I made a post about this in another thread.
Re: This is beyond craziness