It really comes down to 2 things:
Was there a restraint of trade clause in Lambert's contract, and had it expired?
Did Bridgestone's ad agency knowingly hire Lambert for a Wii promotion because he's a familiar gaming face?
The first is pretty easy to sort out. The second is very difficult to prove unless someone wrote it down at some point, and even then is it an actionable motive? I suspect not given Bridgestone isn't selling game consoles. Might be a slightly different story if it was a direct Wii add.
Silly and frivolous of Sony to sue, even if they end up being legally in the right.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
