This can hardly be an obstacle in porting the OS. The board is here, pretty polished, feature-rich, easily affordable and available.
Obviously the HaikuOS developers have just found RISC-V easier and having more potential. Or somebody just has sponsored the effort.
they're in bed w broadcom. also think of all the additional bite people end up buying to run em
Perhaps. But this means Broadcom propagates itself the adorably right way, beneficial to everybody. Also note "all the additional bite people end up buying" is mostly made by other parties, often small indy businesses. E.g. I have bought a 3D-printed chassis suiting my needs from a local vendor (and they also offer the source model and customization on demand).