Reddit's /r/plex is full of similar feedback. Previously, free streaming of your own media was a way for them to possibly draw you in to their paid offerings. Now how will they acquire customers?
In any case, I've mostly moved over to Jellyfin now that there is a decent app for it available on my Amazon Fire Stick. Have to say, Jellyfin may have been clunky in the past, but now it's a real alternative to Plex.
