Great... LOOP coop-closed channel with me because most of sats had gone to their side and they could not wait mere 3 hours until I would start rebalancing it. I would not care and rant if this wasn't in such high-fee environment. I guess they do it automatically, and their script does not take into account the current on-chain fee.

At least some justice: the closing tx is still unconfirmed, perhaps even expulsed from mempool (becasue the channel tx output appears unspent). So they did not gain anything.