You might try switching your router to an open source operating system or using a Raspberry Pi with something like Pihole.

You can block many IP's to prevent adverts and suspicious activity, as well as set up something like a rotating VPN server for every device in your home.

But what you're talking about is a company bugging your house, perhaps through a backdoor in Android. All for advertising purposes.

I'd say it's pretty crazy, if I hadn't heard so many stories and witnessed very sketchy things myself.