How are you framing this? It’s an Electron app so it exists but doesn’t integrate or perform great. Last I recall you still were required to provide a SIM to sign up & you needed an iOS or Android primary device to even use the desktop client. Can you use a standalone, fast desktop application like you can these other protocols? I would say no, so “support” has shades of gray to it.

This is how I got kicked off LINE… they had a Chromium app that I could use tethered to an app, they disabled support for LINE Lite (which had light/dark theme, E2EE, texting, voice/video calls, debatable trackers (Firebase), even stickers & sending a location @ 8MiB instead of 200MiB+ of the “heavy app”), I refused to “upgrade” as it was a downgrade to me, & since I was no longer registered with a “primary” device, I was booted from the network. I don’t think I want these mobile-duopoly-required apps to be my primary means of communication with folks—especially now that my primary phone isn’t Apple or Google (luckily Open Whisper lets WhisperFish exist).

Has done for years now, but its desktop support is far inferior to even Matrix chat clients. It works in a pinch but you have to lower your standards quite a lot to use it as a true alternative.