Sure they can't hold your funds, or spend them, but they do get to control some portion of your ability to send/receive them. I don't know that it's fair to say that what defines a custodial service who's holding your private key.
A cloud VPS service is custodial because it handles hardware provisioning and networking for me.
A DNS provider is custodial because technically it's possibly to host your own name servers
My ISP is custodial because it also does networking and routing for me as a service.
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i don't think they get to control, only to restrict, there's a difference, and if they do that too much they risk losing your subscription
same with the cloud VPS and same with the DNS registrar, and same with the ISP - ok, in some places all of these things have a high cost to give the old provider a GFY but when you get mad that is worth the price of the fuck you money and well that's part of why bitcoin anyway
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.