

I host Synapse using this playbook. I can highly recommend it - the instructions are very clear and detailed and ongoing maintenance is straightforward too (just git pull and redeploy, and 5% of the time modify a deprecated variable).
As for how to delegate to a subdomain - that’s covered here. Basically - you set it up on matrix.example.eu
and then have a “well known” file hosted at example.eu
that tells other clients/servers where to look.
I have read so many posts like this, that try to explain why their company is a special case and why it could never happen to them, only to see the same thing happen again and again.
Tailscale are trying to insert themselves into the stack and become the go-to choice for this kind of networking. When their customers are dependent on it, of course they’ll start extracting rent and capturing as much as they can.
That’s their right, but it’s also a little condescending to pretend otherwise.