Probably because the TB offense is lame AF. Rachaad White is putting up nearly 3.0 ypc. Despite first ballot HOF forever Mike Evans (always been a fan), they've really got nothing.
To add, their defense is 27th against the run. Tampa Bay is nothing special. I get that the Giants and Patriots are also nothing special, but contrarians need to pull themselves back from riding Baker Mayfield into some gambling sunlight tomorrow. He's not very good and the Bucs aren't very good. There's a reason oracle Vegas has us heavily favored.