These companies would be risking their cash cows on an unproven OS. On top of that, they are the primary beneficiaries of Huawei's lost market share from smartphones. So, it's very clear why they wouldn't adopt Harmony OS, "at least right now". I'm very sure they are considering it in one form or another because they need a back up plan given the US escalating threats. My feeling is they are planning a way to quickly roll it out in the event Google is sanctioned from them. Then they could have it pushed to all their phones as an "update".
Remember when Harmony OS was first unveiled at the Huawei World Developer conference in 2019? It was explicitly mentioned that Xiaomi, Oppo, Vivo, Meizu and Lenovo were cooperating on Harmony OS development. I am confident that all of them are planning on releasing China localized ROMs for their China sold phones, and "IF" that is successful, to follow with global ROMs for various languages while they sell pre-installed Harmony OS phones within China.
Why do you call Jack Ma treasonous? The way I understand it, his AliPay venture had the potential to endanger China's financial system because it was promoting a dangerous form of leveraged financial arbitrage. He then later publicly criticized China's financial regulators as being an obsolete organization with a pawn shop mentality. This kind of disdain for financial regulation must have been seen as a threat to China's financial integrity given the size of Alibaba and the way they use China's traditional banking system to run their financial arbitrage lending business. It's not about treason, it's about financial risk with a wayward billionaire. The only thing that is treasonous about Jack Ma imo, is his ownership of SCMP and allowing the editorial department to promote news with the atypical Western anti-China bias. It's pretty obvious at SCMP but not AS obvious as with the more blatant CNN, BBC, FOX News, Reuters, AFP, DW, Al Jazeera, The Economist, Bloomberg, Forbes, New York Times, Washington Post, The Guardian, The Telegraph, Facebook, Youtube, Google search, Twitter, Wikipedia, etc, etc, etc, etc, etc, etc....