The Equilibrium parachain lost its Polkadot slot lease in February 2023 and stopped producing blocks. The Parallel parachain is still operational but has been abandoned by its team. I've heard that there is 1.5M DOT stranded on Parallel.
This proposal will close HRMP channels to and from the (non-existent) Equilibrium chain and close the channel from Interlay -> Parallel. The return channel is left open because I see a few thousand dollars worth of INTR and iBTC still sitting in several accounts on Parallel. Leaving the return channel (Parallel->Interlay) open allows those users the ability to move funds back to the operational Interlay chain.
Educational sidenote: since XCM uses reserves on each parachain instead of actually moving tokens between chains, you can look at the sibling account on Interlay for any other chain to see the total funds moved from Interlay into that other chain.
You can find a chain's sibling acct address by 1) Look at subscan's "Hot Channels" list to get each parachain's ID 2) Use Shawn Tabrizi's "Substrate Utilities" to convert parachain ID into Sibling acct and 3) look at that address on Subscan.
Equilibrium sibling acct on Interlay: https://interlay.subscan.io/account/5Eg2fntLDxSsJAuwHC7GpsPcPCW1NidnVuuueRNigVuRwREd
contains 5903 INTR and 0.0274 iBTC
Parallel sibling acct on Interlay: https://interlay.subscan.io/account/5Eg2fntLRaW3pHqk6pb1242gUqARX5Zubd8jH2YHGnwQADmR
contains 154,587 INTR and 0.0368 iBTC
Motivations to close these XCM channels:
This proposal includes compensation for 5 hours for researching active channels, trying to identify owners of the Equilibrium and Parallel accounts (no identities available), discussing options in Interlay community, Chopsticks testing, and proposal creation. 5 x $100/hr at $0.02176/INTR.