As of October 2024, there are 125 states parties to the Rome Statute, which are represented in the court's governing body, the Assembly of States Parties. Countries that are not party to the Rome Statute and do not recognise the court's jurisdiction include China, India, Russia, and the United States.
Member states represent around a third of the world population.
What happens if MS decides that using competitors software is "shady" - they have previous form of unfair competition practices, so it's not unlikely.
Also, what happens if the US administration decides that MS software is only authorised if you have white skin and support Trump?