Most likely because, in the business world, everyone is always targeting everyone. Apple is regularly on BOTH sides of lawsuits just like every other company out there.
You might want to check your link next time... that picture won't be posted ever due to the name of it... I know which one you mean...
See? No issue
Oh and OP, Apple is getting sued left and right always. They also sue left and right... part of the great circle of the Patent Office and Patent Vampiric lawyers.