Is this because you send the transaction with a 0 fee payable and then confirm it ourselves with the next block we find, unless someone else adds it to their block and makes no fee from it?
Bingo
I like this... But how much is actually saved in fees? is it worth the wait?
I do recall a free transaction accelerator, but it obviously needs the transaction ID, which I do not know, and I don't think its listed on the website anywhere. Be neat to try it and see if it actually works.
Found one:
https://www.toxigon.com/free-bitcoin-tx-accelerator/