lol there is nothing wrong with Lemmy.zip. It’s a legit Lemmy instance and the communities are safe.

The concern is that someone might try to make a website / URL appear to be a zip file you can download and open. But Lemmy.zip is not doing that.

Also you are on a different Lemmy instance, so you never interact with Lemmy.zip directly. Instead, behind the scenes, your instance exchanges data with Lemmy.zip, and all other instances it is federated with, regardless of whether you personally subscribe to any .zip communities or not.