What can be done to ostracize them ?
I would like to see the ability to blacklist routing a payment through my node if it has come via such a node.
Set max htlc to 0 on the lqwd channel or just close it.
Is there a way to blacklist a node from routing through for outgoing payments on LND or CLN?
I don't think so mainly because the routing node doesn't know the full path. I know you can set ignoreNode in eclair and "exclude" in lightning-cli pay but those are for building a route for your own payment.
Yes, that what I wanted to do
Yes, naturally if one has a channel open already (I don't) but what I mean is it would be great if we could refuse any routing if the route thus far had included that node. Effectively blacklisting them out of routability if enough people did it. I don't think that's possible, though.