I think the "bitswap-peering" is going to be a bit awkward as a cascade because it's unclear which peers are being peered with by a given provider.
I wonder if it would make sense to call it something like "infura-bitswap-peering" or "2023-non-dht-bitswap-peering" or something to express the caveat
I agree with @masih that it seems reasonable at this point to hope it doesn't last for particularly long, and is not a mechanism i'd expect to encourage other partners to run
Update the specification with extension to legacy cascade over BitSwap along with options to discover peering addrs.