Can I be anonymous in a private tracker?

Does it make sense to use Tribler in a private tracker? or it is useless?

All my torrents from private or public trackers appear as: No anonymous.

The anonymous flag it’s just telling you if the torrent traffic for that specific .torrent is going through the anontunnel community or not.

When you use a private torrent, it will not be added to Tribler’s content discovery system, so if you only use Tribler to download private torrents and not any of the features that differentiate Tribler from a normal bittorrent client (Such as content discovery, anontunnel community, etc.), then it does not make any difference to you.

Are you asking if bittorrent can be used to distribute malicious software?

Any file transfer protocol can be used, including bittorrent.