infomaniak is the largest swiss cloud provider, they have multiple services which are domain related (purchase and management), cloud computing and more. They have a good reputation. They also have a swiss cloud certificated meaning they are able to host data in Switzerland and manage it from Switzerland. If you trust Switzerland for privacy, I think by extension you can trust them.
i think they mean that signal on desktop does not encrypt their content at rest, which is acknowledged and not an issue they are intending on addressing.
But it seems to have recently changed? I’m learning thus as I wanted to find a source.
Source: https://candid.technology/signal-encryption-key-flaw-desktop-app-fixed/