The 4096 bits just stops it being so easy to surveil you that it is hyper-automated. So there is some use. The $5 wrench needs a million dollar operation to get that guy to your house.
Depends how strong the protections of your civil society is, but it doesn't cost $1m to send a goon with a crowbar or shotgun. Sure that doesn't scale, but if you are a target you're screwed
Probably used to average over $1m. Nowadays, those operations (polonium, novachuk, expending expensive KGB resources) send a signal. Otherwise, swatting your home while they drain your wallets; or threatening to swat; quite inexpensive.