You can trust BugCorp all you want but there are more sshd processes out there than tailnets and the scrutiny is on OpenSSH. We are not comparing sshd to say WordPress here. Maybe when you don’t over engineer a solution you don’t need to spend 100x the resources auditing it…
The few things I self host I keep out in the open. etcd, Kubernetes, Postgres, pgAdmin, Grafana and Keycloak but I can see why someone would want to hide inside a private network.