There are no need of subscriptions in Portmaster, it’s FOSS. Well, the subscription is only if you want to use additional also the inbuild SPN service (optional service), which need an paid subscription like any good VPN (server cost money). I Prefer to use Portmaster over Pi-Hole, because Portmaster permits per app settings, Pi-Hole don’tm apart is way easier to setup, with already a good default settings, its almost download it, run install and peace. Then maybe open it, browse your listed apps and block their traffic if needed with an click.