use a “gcam port”

Security is probably the most important, but there are also general chat utility features such as replies and read receipts.

So you chose tencent?

yes this is oversimplified blah blah

Don’t use Raspberry pi.

Oversimplified and in many cases is not good advice. Raspberry Pis are perfectly capable low cost home servers that absolutely sip power and take up little room.

Mini pc’s such as dell optiplex micro’s and intel nucs are also a good consideration.