Also, how many Cake wallet users (or Blitz, or Wallet of Satsohi) actually understand that their I.P. addresses are going to LightSpark?

I bet if you asked 10 of them randomly, none of them would know.

Contrast this, say, to CoinOS. How many CoinOs users know that CoinOs gets to see their I.P. address? All of them know it. It's obvious.