Removing the “and” option would make readability and usability better for the end user.
A rust server can only be categorized as either “standard” or “hardcore”, so there’s no reason to have the “and” option as when you search for both types and set to “and” you won’t get any results.
Similarly, same for the server type (well, type as the page displays). A server can only be “official” “modded” or “community” never more than 1. So there’s no point in having the “and” option there as well.