It would be interesting to see if it could be used as a building block for development of an Ethernet/USB card for the A500.
What for? There are numerous Compact Flash options and it is faster to put the card in the PC, copy files, then take it out and put in the Amiga to transfer large amounts.
Without a CPU upgrade you're not going to be able to run any meaningful live internet software, i.e. web-browser etc.
Pricing on the Subway is still $120ish, and there is still no functional Ethernet solution for the A500, which makes me sad.
Does subway not support the $5 USB->ethernet bridges? Deneb does.
The MCF52256 and 52255 cost less than $8 in single quantities, and are therefore well-suited to low-quantity runs and experimentation.
The chip at the heart of the Subway only costs $3. It is not the raw materials. It is the NRE (non recoverable expenditure, design & manufacture tooling costs)