Users who are messaging through the mobile Facebook website are being told that "soon you'll only be able to view your messages from Messenger". The functionality is about to get cut from the mobile app just as it was cut from the original Facebook app.
That's not good news for people who can't or don't want to install Messenger on their phones for whatever reason. For Facebook, it's a way to drag everyone over to the Messenger app, now that one-to-one messaging is becoming more appealing than staring at a traditional news feed.
Chat's the way to do it
Messenger has its own home on desktop browsers which isn't going away but mobile users will be out of luck in a few weeks. When someone brings out a Windows 10 Mobile app, then you know they're really serious about dominating the market.
Soon the only alternative to the official Messenger apps will be Facebook Lite, which you won't be able to get if you're not in a select number of developing countries. Facebook Lite highlights another reason why people might want to eschew the Messenger app: its higher data usage, thanks to all those stickers and GIFs.
It's Facebook's platform, of course, so it can do whatever it wants with it - but it seems a shame to corral users in this way. There are plenty of alternative chatting apps out there if you think Facebook Messenger is becoming too bloated, though you might find that your next choice is also being run by Mark Zuckerberg.