Apple made it happen on the client, but Amazon is making it happen on the server. The people who want to run their own DCs or hardware will end up part of the niche left on x86. I don't see Apple doing anything in the server space beyond providing minis like they do now.
(I’m not sure whether that includes servers at large cloud providers, but I don’t think that matters. Unless there’s a huge performance advantage, I don’t see Amazon, Google or Microsoft buying Apple server CPUs)
If they are to be commercialized, I’d expect them to be part of a development stack related to Xcode, or some kind of AWS like services for applications developed for the Apple ecosystem.
Offering generalized compute would invite too much initial cost performance comparison and they couldn’t keep up with demand.
iServer with 64 cores and 256 GiB DDR4 for only $ 699,999.95
You are off by an order of magnitude :)