Download Signal Private Messenger.
https://apps.apple.com/us/app/signal-private-messenger/id874139669
https://play.google.com/store/apps/details?id=org.thoughtcrime.securesms
https://signal.org/android/apk/
Create local groups.
Organize there.
Migrate any sensitive discussion to Signal. If possible, migrate all messaging to encrypted traffic. By using encrypted traffic you safeguard encrypted tactical exchange via obfuscation. A drop in an ocean is less identifiable than a drop in a pond.
Always turn on disappearing messages. Have a backup mechanism for when they take down Signal, as it is inevitable.
You've been invaded. Act accordingly.
A third of games? What are you smoking?
Over 95% of games in my experience work on Linux, and perform better than windows.
What kind of people are still using Windows, anyway? That supports one of the most terrible companies on the planet, invades your privacy, worms into your brain, and takes over your hardware...all for your 1 or 2 games you want to play?
This Steam Machine is going to be a blowout success. Linux gaming is superior in nearly every way. It's cheaper, it's more ethical, and it gives you back control.