If they see a similar use for Linux support, they'll do the same. If they think it will hurt them in some way, they won't.
But I think it's fair to at least consider the "undermine" possibility considering that on iPhones they've consistently blocked attempts to jailbreak or open that platform in the way an alternate OS does on their Macs. We've already seen incremental moves to make MacOS app distribution more centrally controlled. So I honestly don't know where Apple believes their long-term interested to be on the topic of facilitating, or at least not actively blocking Linux.