What are the positives and negatives of leaving a lightning payment channel open? How am I contributing to the lightning network and what are the risks if any?
In Electrum? I think keeping it open will not contribute to the network since Electrum-made channels (
trampoline or not) don't route payments (
CMIIAW).
Anyhow, it's best to keep your channel(s) open in case you need to send more lightning funds and if you still don't need the funds onchain.