I wrote about Kollider exchange last month in
The Lightning Network FAQ topic, and I am following it since then.
It looks like a promising project, especially since it has it's own version of fiat currencies USD/EUR that are backed only by Bitcoin, so there are no altcoins or stable coins involved.
If we want to reduce risk and switch from centralized exchanges, we need projects like this and more popular decentralized exchanges.
One thing I don't understand is how and why they have Ethereum(USD pair there.
Have you used them yet? I haven't seen your post until now. I made a topic about them earlier today after coming across them on Twitter.
I didn't use Kolider yet, since it is still in beta phase.