Did capital make the big difference? Apple didn't take huge VC rounds back then and lasted much longer.

I think it was just relative lack of apps in the end. Microsoft commodified the hardware so it became competitive and prices fell dramatically. Every other company stayed attached to their integrated designs and couldn't keep up on cost. Apple held on for a while because of the bigger US ecosystem and economy but nearly got wiped out also.

Also the RiscOS wasn't really backwards compatible with BBC apps and games, iirc. More like a clean-sheet design.

Lack of capital almost killed Apple.