That's fair and I often do add archive when I know there's a paywall. I've got a plugin that does a decent job of unpaywalling, so sometimes I don't even notice it. So I agree with you that adding archived links is a courtesy, but people acting as if not posting a link at all would be better are just being unreasonable in my opinion. This is the plugin I mentioned incidentally

https://github.com/iamadamdev/bypass-paywalls-chrome