While Warframe is a perfect example of a well done FTP model, you can buy a lot of stuff with real money in Warframe, it isn’t just cosmetics. But it has limited PVP and the community is fairly friendly, so it isn’t so much Pay-To-Win as it is Pay-To-Not-Work-Hard.
There absolutely is, call the cops. Take a video of the drone spying on you as evidence. Spying on your neighbors is illegal, you just can’t take the law into your own hands and shoot it out of the sky.
I do wish there was more power we had as individuals to stop this but I do not think using a dangerous weapon to destroy it which could potentially also harm another human is the solution either.