@Evv1L you can put those links into your client to join still, the page on matrix.to just makes it prettier. matrix.to is also a very simple website, so anyone can host it and you just need to change the url, you can even change /etc/hosts to point to a non-blocked site.
@sulian @Evv1L I think changing /etc/hosts won't help because TLS certificates on a different server won't match.