Would a service like this work on people who don't use the popular social networks?

E.g. I get my news + dopamine from the local newspaper (physical paper edition) and HN, respectively. Ofc HN pretty much qualifies as a social network, but it has no targeting. My girlfriend isn't on any social network at all, unless WhatsApp qualifies as one and IMO it doesn't, unless you have a gazillion active group chats (which sounds like hell on earth).

I'm inclined to think that this makes both of us immune to attacks like the ones performed by this company, but I have an uneasy feeling that I'm missing something. Anyone with a better insight in targeting hacks than me able to chip in?