I've got my own issues with Tekken, but what are you referring to? The scummiest thing I saw them do was locking replays against characters you don't own the DLC for.
Some say they intentionally didn't release the character costume cash shop until after the release of the game as to not taint the reviews of the game. They always say the money go towards upkeep and future development but still charge for season passes and characters that are locked behind that.