1941
As if it wasn't bad enough that they want me to use a random internet service to add a keyboard to a usb wifi receiver, they have the balls to put this for Firefox users. I clicked out of pure curiosity, as I'm not even remotely interested in involving a corporate internet service in getting my keyboard connected to my computer. This is the message you get now on Logi Options software if you have a Unifying Receiver: 
For the curious: https://logiwebconnect.com
EDIT: some people on the thread have brought up that the error message being displayed for Firefox users is due to the WebUSB API not being implemented by Firefox due to security concerns. This still does not justify having to use a web app to plug peripherals to a PC.
In fairness to me this kind of thing is nothing new on Logitech’s part. Back in the XP/Vista days, Logitech refused to follow established usb standards for things like webcam’s and the like. So we depended on Logitech providing drivers, which they didn’t bother doing for a lot of their hardware beyond XP. So all of a sudden a 1 year old bit of hardware wouldn’t work on Vista because reasons.
Logitech and Creative Labs were the absolute worst for forcing proprietary tech and then refusing to support it properly.