We are also changing how remote playback works for streaming personal media (that is, playback when not on the same local network as the server). The reality is that we need more resources to continue putting forth the best personal media experience, and as a result, we will no longer offer remote playback as a free feature. This—alongside the new Plex Pass pricing—will help provide those resources. This change will apply to the future release of our new Plex experience for mobile and other platforms.
My dude if you are connecting from outside your local network you are “exposed” to the Internet in some way. What magic are you thinking Plex is doing? Is someone hand deliverying the packets via USPS?
In some way is different from directly, on Plex you’re behind a relay server so it’s akin to being behind a VPS running Authentik/Authelia in front of the service on your home. Compromising the relay server does not necessarily compromises your home server, so it’s not direct like putting Jellyfin on a reverse Proxy would be.
Plex runs relay servers where your Plex server will connect to the relay and your player will also connect to the relay, making both ends of the connection egress type as far as routing and access control goes. https://support.plex.tv/articles/216766168-accessing-a-server-through-relay/
It’s optional and likely not everyone uses it, but this provides a way for Plex to do remote streaming without the Plex server being reachable directly from the internet.
Separately, it costs money for Plex to run.