

Lastly, “them” setting up seemingly good persistence on your system, yet not hiding any indicators of compromise, and then nuking everything when they are seen.
That seems sort of plausible to me. It was hidden, but it’s not perfectly hidden.
My interpretation was OP isn’t necessarily the target here, but a victim of some Windows hack spreading around their shared network. It’s possible the whole network was “worth” such attention.

It’s not! Use SonoBus; it’s dead simple, and superior to Discord. It’s far lower latency, with customizable filters, peer-to-peer; and totally free.
Now if you want emojis and video and rambling channels and stuff, you will have to go elsewhere.