I'm not 100% sure on the relisting rules but AFAIK a game is on the new releases based on its original release date and no other date. So if it reappears and there's not been enough new games to bump it off them it will be on there. If its been too long then you won't be on the list. Thats how it works when developers have pulled their own games.
As for IP issues, is Microsoft get a complaint by an IP owner they are obliged to investigate and their policy is to pull the game while that happens - its no different to what YuoTube etc do during an investigation. Remeber Microsoft are just a distributor for these apps. Its your responsibility to ensure you are legal and its your resonsibility too if the s*** hits the fan if you have crossed a line.
Its well known that the Tetris company are very protective
http://www.gamasutra.com/php-bin/news_index.php?story=22815 so you could have opened a can of worms.
NOTE: Thats an article by a lawyer not my personal opinion on right and wrong.... debates on the copyright laws in this thread is going to get it locked, very very quickly so I recommend everyone avoids that....
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