That would be a conflation of self-custody with self-hosting. Custody is, who holds the keys. Hosting is who controls the computer where the software is running. Now, if you are running your Alby Hub on anyone else's computer/server, it may still be self-custody, but it is not self-hosted, and there are certain sovereignty trade-offs you are making. They may or may not be worth it to you, but they are also very different tradeoffs from someone else holding the keys to your funds.