If you would like a more technical explanation search for CG-NAT. It allows ISP’s to share a single static public facing IP with several customers at once.
If you had a true static IP that never changed you’ve only see results about torrents downloaded using your router.
I Know What You Download (via torrent) (iknowwhatyoudownload.com)
I guess this settles it for me. What VPN should I go for?