They don’t compete in that space, so they have exactly zero market share. Indeed, everyone can rightfully say they’re not a competitor in cloud compute lol.
They are cutting back on outside expenditures though, as they continue to build out their own data centers. Maybe they got fed up with outages, or perhaps it’s just too expensive and they can save money by bringing it in house.
Either way, their internal capabilities are apparently quite extensive, as they’ve reportedly slashed their AWS spending by more than $400 million/year. Their google spend is also down, supposedly due to some incompetence on Google’s part that disrupted iCloud services. Sometimes, if you want something done right...
Of course, if Apple perceives the market is too commoditized, they won’t enter as a service provider. Why get into a price war with Amazon/Google/Microsoft/et al; that wouldn’t make any sense at all. They could just continue to keep it in-house as a competitive advantage instead.
But if they can offer something unique that would give customers a compelling reason to choose an Apple offering over others’, there’s certainly no reason they couldn’t productize it. They could definitely bring millions of low-power CPU/GPU/NPU cores to the table; they’re already doing upwards of a billion or more of each of those every year, just with their current silicon.
They’ve stayed closed mouth on any future plans as of yet; given the recent debacle of AirPower, they may walk the walk before they ever talk the talk... who knows ¯\_(ツ)_/¯