sounds like paypal owned funds stored in paxos, where paypal wanted to withdraw small amount from paxos, but paxos(the withdrawal service) sent out the small withdrawal amount but using a large utxo without using a change address for remaining unspent output balance
yep.
f2pool should upcharge at least 2 coins.
i am in a very small pool that hits a block every 2 or 3 years.
I usually get 40% of the block and fees.
So 6+19=25 x 40% is 10 coins. about 7.2 would be the extra fee.
the other two miners in this pool would get
12 and 3 coins
pool is set up to auto send when block is hit so I would handle the ten coins. about 7.2 should go back to them.
but I would have to get a lawyer and special tax letters so That the irs does not try to tax the 7.2 I return.