> Apple and Google own the entire mobile OS market. They could literally destroy Microsoft if they started to hugely degrade the experience of Microsoft products on iOS and Android with dark patterns a la Microsoft. But they don't.

They could not, because if they did that cartel suits would be opened within hours. Iwould expect both the US and Europe have such suits ready to go just in case, and Microsoft (hypocritically) has amicus briefs on standby.