Taxi Chaos... I can sort of understand on account it could be more of a successor to Team6 Taxi series, they've been making games like Crazy Taxi since 2002 so I dunno why Taxi Chaos of all games is regarded the "successor" of Crazy Taxi when Team6 already made Taxi Challenge Berlin, Taxi Racer 2 (various countries), Taxi 3: eXtreme Rush and Super Taxi driver 2006.
Yes Team6's taxi series is ripping off Crazy Taxi to a degree but it's not like you can put a trademark on public vehicles for hire.
As for the "Sega vs Fox Interactive" War I don't know of it. Yes Simpsons Road Rage is definitely a lot like Crazy Taxi, but so is how
PlayStation All-Stars Battle Royale is an obvious rip off of Super Smash Bros. but Nintendo doesn't lift a finger to sue Sony Entertainment.
I guess Paperball is in the same regard, it's just the gameplay of Super Monkey Ball is more unique and licenced than the genre it sets.
Wow, I'm some what reminded of Vrtua Fighter.
Sega: Hey world, look at this brand new fighting game we made! It's the worlds first fully 3D fighting game!
Namco, Team Ninja, Project Soul: Yoink!