It's genuinely weird that they still don't have a virtual console for anything other than a select few NES games. We're midway through the Switch's lifecyle already!
I've never heard a compelling reason for Nintendo not doing this. Why don't they have a full catalog available on the Switch? It's technically feasible and would make them boatloads of cash.
Probable because of licensing reasons. Nintendo may have a license to distribute a game, but it’s probably limited to the console it was designed for.