Gnometris apparently isn't included because there are legal issues ("All Tetris clones are illegal", see bug 84407 and bug 148883) so doesn't this mean that tetris-bsd shouldn't be included either? Tetris-bsd even uses the name 'tetris' unlike gnometris.
The use of the name 'tetris' is an oversight and will be corrected shortly. As for including the game itself, I've asked for some advice/clarification from the Fedora community on whether this is allowed or not.
Well, I don't really know whether it's allowed or is illegal personally, I just noticed that "All Tetris clones are illegal" was a quote a Red Hate developer made in the other bug report.
Based on the discussion on fedora-devel-list and bug #224627, it seems that it's enough to remove all user-visible references to tetris in the game, while the game itself can remain. This has been done in the latest bsd-games-2.17-20 release.