I am not so sure it works. I heard it rumoured it was more or less disabled. I did sense the share min amount of files did still work though a few years ago when I experimented with different amounts. Could not be guarenteed though, after all if LW struggles to browse them then ...

To block downloader, right-click user & you will see option. But keep in mind, browse is not a 100% accurate tool. eg: sometimes I browse a host & it shows perhaps 230 files, a few mins later less or more. Sometimes it does not show any result, yet they are obviously sharing. But yes, I believed there are a lot of freeloaders out there who share rubbish or nothing.