Lawsuits are costly in terms of money and time invested. They’re a drag. Just the threat of suing often is enough. Incentives are not necessarily equal. You might have on one side a startup just trying to get a product out of the door, on the other side a zealot trying to push his agenda. The whole thing could end up sinking the startup. What’s a viable risk/payoff trade off?

Copyrights can be inherited, too. Who knows if the estate doesn’t have a particular view on good and evil and spends the entire inheritance suing small scale developers just to prove a point.

Now, in this case, it’s a fairly obviously benign case, but for good reasons, (corporate) lawyers stick to well-known licenses and risk avoidance.