We have recently experienced a security incident that may potentially involve your Plex account information. We believe the actual impact of this incident is limited; however, action is required from you to ensure your account remains secure. What happened An unauthorized third party accessed a limited subset of customer data from one of our databases. While we quickly contained the incident, information that was accessed included emails, usernames, securely hashed passwords and authentication ...
Because you are hosting the server software on your own hardware. That’s literally self-hosting. Plex provides a way to remotely access your server through their own network as well, which is optional.
On a side note: you can remotely access any service running on home network via Tailscale[1] / Cloudflare Tunnel. Your services are never exposed on Internet. Moreover, you don’t need to rely on Plex for that.
[1] https://tailscale.com/ [2] https://developers.cloudflare.com/cloudflare-one/connections/connect-networks/