I wonder, how Lightning Network is classified. Is it a mixer or not? Because:
1. You can open a channel (a decentralized equivalent of putting coins into some mixer).
2. You can send your coins inside LN (this is where "mixing" phase can happen).
3. You can close a channel, or even get your coins back, without closing your channel (because of swaps, and you can end up with different on-chain coins than you started with).
And then, the question is: if you have some LN wallet, that allows you to get your on-chain coins, without closing your channel, and that is the default behavior of this wallet (for example Phoenix wallet did that), then is it a mixer or not?
I would say no for these reasons,
1. LN usually mentioned as solution towards scaling or microtransaction.
2. LN is non-custodial, unless you use custodial service.
3. LN doesn't offer that much privacy unless you believe other party doesn't keep log and LN software you use have additional privacy feature (e.g. use Tor by default)