https://www.theregister.co.uk/2001/06/02/ballmer_linux_is_a_...
He was CEO of Microsoft until 2014, that is, 6 years ago.
Microsoft changed strategies because they tried everything they possible could to counter open source and Linux and lost. Now they are forced to play nice.
Being forced to be nice is not the same as being nice out of altruism.
If at any moment becoming jerks gives them more shareholder value they will become jerks again.