Bit of a reach there. Fortress is a different company from Prime with the same founder. Both companies partnered with Swan. It's not a deep market. There are not many choices for custodian integrations. The biggest issue is finding a custodian that can scale the seperate trust account for each customer model that swan uses. This model provides legal protection for customer funds in the event of custodian bankruptcy. Nobody else does this AFAIK.
BTW swan now supports multiple custodians. We are working to build a nice integration layer to bring on even more. Also, I can't say much about it but Swan is working on a very smart long play here. We're hard at work setting up a bitcoin only custodian.
I think your distaste for swan is way overblown. It's trendy to hate on swan but we are pursuing a unique strategy. Time will tell what strategy is most appropriate or who executes better but I, for one, am very glad to have multiple teams of bitcoiners trying all different approaches to solve the same problem.
It's easy to criticize builders. Much harder to build something from nothing. Ask yourself this: are you a net contributor or a net detractor to the cause of freedom technology?