It still uses PoW from the old bitmox chain right now. So you could theoretically get some of the tx fees which are supposed to go the dev fund, but it is not much. See answer above
Yes, but
XFUEL is using new algorithm, on 10 hard coded nodes (test-chain for the developer).
When XBY goes over to the new chain tech will it be automatic or will there be some sort of swap?