No, our servers should not be an advertisement banner for Plexs’ own streaming content. I brought Plex to manage and host my own content, end of.
In this case, it wouldn’t.
My proposal is as such:
Anon user goes to https://plex.mydomain.com.
User gets the following prompts:

So they never actually view anything on your server, it all goes back to how it used to work + the added benefit (to Plex) of allowing their free content to work on their web player via a redirect to plex.tv.
Alternatively, we need people to vote on Restrict Plex Web to LAN Networks
Apologies for the crappy Photoshop job, haven’t used it in years!