Well how do you combat that if you are in a household or shared network with others who aren’t privacy conscious?

I had considered that, but that would mean they are collating and amalgamating data coming from a single IP, which is almost as bad as listening to my microphone. Both are data gathering without my permission.

I’m not so sure. I’m interested in this thread because I had a recent issue like this. I barely use Instagram, hadn’t booted the app for a month or something, only have it to support my SO’s art account. Never comment/DM, just likes. Had a lengthy in person conversation about tattoos and the idea of getting them at current location. I didnt do any searches on my phone or any other device for that matter. Don’t have any tattoos, or ever look at that content on insta (only follow art and wildlife photography accounts). Booted up Instagram that day and was getting purely adverts for local tattoos studios on my feed. Checked my permissions, all disabled. The only explanation I have is that it’s somehow still listening. That can’t possibly be a coincidence.