Correct. Remote streaming used to be free. That changed...in April? I don't remember the exact date but it was announced earlier this year and has been slowly rolling out. Now you either have to have a Plex pass for your server or each user who wants to remote stream has to pay for a remote watching subscription and show in OPs screenshot.
There are of course ways to get around this such as all your users being on a VPN so as far as Plex can see its "internal". I suppose if you use a reverse proxy but didn't pass X-forwarded-for headers then that may get around it as well? I never messed with it as I was looking for an excuse to dump Plex anyway. Now I'm finally jellyfin only.
Yeah I didnt abandon Plex because I couldn't afford it. I have a number of gripes with plex but as long as it remained free I had no strong motivated to get rid of it. Now that I would have to pay though I have no interest in keeping it around. I am quite happy with jellyfin even if it may lack polish on some of its facets and I regularly accept inconvenience to uphold my own operating philosphies.