IMPORTANT NOTE FOR CURRENT PLEX PASS HOLDERS:
For users who have an active Plex Pass subscription, remote playback will continue to be available to you without interruption from any Plex Media Server, after these changes go into effect. When running your own Plex Media Server as a subscriber, other users to whom you have granted access can also stream from the server (whether local or remote), without ANY additional charge—not even a mobile activation fee.
If you're already paying for a Plex Pass subscription, or have the Lifetime Plex Pass, this change won't affect anything. You'll continue streaming Plex remotely and any friends/family who have access to your server will still get to stream it remotely as well.
The cost of the Lifetime Plex Pass is more than doubling in price at the end of April, so if you don't want to pay for a monthly/annual subscription, buy it now while it's only $120. I bought it several years ago and it's more than paid for itself over the years.