Hey, sure I answer the points:
1. We have chosen BSD as base and future out of two major reasonings: First we see GNU/Linux (GNU/Linux-libre) and Linux in general going the wrong ways from our perspective. Stable API and ABI references and a smaller codebase without current hyped languages likewise Rust is for us the way forward instead to add even more complexity just alone on the level of kernel, drivers and kernel-modules. Second we want to provide one operating-system from one source as out of the first named point we see the unstable way Linux and system-projects in the majority have chosen (please read here more: https://www.hyperbola.info/news/announc … roadmap/). Per default BSDs have a far more permissive model, which in itself leaves more options for companies not explicite to share their enhancements and additions under the current situation.
2. You have made a good point there: Yes, the current situation within our global society and economy leaves not so many options for any kind of altruistic approach and projects doing such are foremost laughed at. That sounds bitter, but I just recall what happened around and with Hyperbola as we tried to explain and clear our points and have never done any kind attack just only offering critical perspectives. As for the moment: The way the global network (internet) is organized I would clearly recommend more to orient on offline based applications. See for individuals hosting services like "immich" may sound "cool and independent" but self-hosting is besides doing that "at home" (local) not so much more. It is always a nice tale that "we" as society can be independent from companies. But while this tale seems nice, the reality is different with NodeJS, Rust and others being used on-going, but not independent from companies. So real independent development looks quite different. This does not mean that FUTO has not a point and sure money is needed for the development of free software also. From our perspective it is more interesting to underline the community-efforts: When people see the software they use as not only something "they get for free" but something like a tool developed with engagement, they may also value it more. And then they may also see points a bit more criticial, while essential libraries, languages used, protocols and formats are just hard signed with trademarks, patents and copyrights. So many of them only pretend to be free while in fact only allow distribution and some modification until the righs-holder disallow this.
3. For the moment I have no further suggestions as aside ARM-based systems are also not allowing too much more, using closed and signed bootloaders and more. And it is surely possible that ARM on-going will be also reviewed and possible more security-chips and frameworks added as Google / Alphabet alone are redoing Android, closing it up: https://f-droid.org/en/2025/09/29/googl … ecree.html
RISC-V as platform may look interesting, but as for now it is far not in the state it could fulfill a replacement fully for user-systems.
In general to the last point: More architectures may look interesting, but I fear we do not have the time to evaluate more as our ecological foot-print is here coming with. It would clearly produce more devices, more hardware while we have our current and should clearly care for it now as long as even possible. 
Human being in favor with clear principles and so also for freedom in soft- and hardware!
Certainly anyone who has the power to make you believe absurdities has the power to make you commit injustices: For a life of every being full with peace and kindness, including diversity and freedom. Capitalism is destroying our minds, the planet itself and the universe in the end!