Karma system.

Your instance is only blocking the weird tankie one, so you dont need to worry about multiple user accounts.

You can check federated/blocked instances here:

https://lemmy.fmhy.ml/instances

Unfortunately this feature seem to be missing for now. The dev has an GitHub issue open on it though so it is on the roadmap.

Nice, thanks!

This is the one that I use. Don't know if it is appealing for people who like to tinker with themes and stuff though. Not much of a themes guy myself. You can tweak colors and use icon packs at least.
Maybe this screenshot of the UI settings can be helpful for you:

So excited for this one. It was the one I used for the last year on reddit.