100%. This is just due to the cost of hitting their servers in case you can’t reach your network

Right, but IIRC anyone can go on the plex.tv website and use shared servers due to the “proxy”

Louis Rossman, a strong advocate for the right to self-repair, has an extensive, bottom to top guide on self hosting your own services. It starts from introducing what a modem is and what role it plays, and it ends with an entirely self hosted cloud. It comes in article as well as 13 hour video form. I would highly recommend this to anyone looking to get started self hosting - it doesn’t just introduce software you should learn, but it also shows you how to configure it.