I use an invite-only tracker. I wonder if that's made the difference.

Anecdotally it seems the only enforcement in the US these days is via ISPs who have made some agreement to "self-enforce" against their residential customers, sending emails threatening to cancel service after three strikes. They seem to only monitor for select "blockbuster" level movies. A friend got one of these as recently as two years ago from CenturyLink iirc. Meanwhile I lived in an apartment building that had a shared (commercial) connection for all the tenants and eventually stopped using a VPN at all, never heard anything.