IMO we need more sovereign systems like this (this is too simple IMO). Other sovereign systems are complex to deploy. if good FOSS commodity options come up, then we can expect a hosting/deployment infra and companies to setup and offer it for non self-hosters as well - ala WordPress.
And also I don't think their architecture is any good for such a product.
For me personally, it would be sufficient to avoid it based on the license alone. But altogether it just looks very unappealing.