RealTek went on to releae an 8139D-for-Delta, which was an almost-reliable chipset, then moved to the 8140 etc. Let’s just say that I don't regard the chipset as exactly a kiss-of-life for a card.
The 8139D had odd limitations which made the writing of drives into a PITA [read the Linux driver source for details], like odd DMA boundaries which implied CPU-copying of network packets to make it all work.
Why someone would deliberately use those chips as the basis for a new card is seriously beyond me. It can’t be cost, because there are plenty of better network chipsets kicking around at low cost.