You say in a sovereign way but you don't appear to want to deploy your own infrastructure?
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Ah, you're looking for a decentralized solution then. I would recommend getting a virtual private server ($20 a month?) And installing start9 on it. Then you can be sovereign (in as much as you trust the hosting service). Check if njal.la offer servers. They won't be cheap but def. Are the best for safety and privacy.
