What's a possible explanation

Part of an explanation would be that they fit in a budget.

What do you mean?

I feel the cameras. It’s making me panic

They said before to me that people like us are parasites and that they can learn from us

The saddest part, which I’ve faced myself, is that there is a very good chance that the opposite is going on. The reality is that probably no one is thinking of you or watching you.

Things cost, in one form or another. If some organization were to track someone then it would cost them. They would have to find it to be worth it.