It’s called “social proof”. The way bullies get their way is because they can gesture broadly at their following and say, “see? We’re popular. Better that you conform than try to resist us”. That gives them lock-in and ecosystem growth. It also makes it harder for competitors when they abuse their position to offer free services that an ethical but smaller provider can’t. It’s also a gateway to Azure, another of their products (which make the Israeli killing fields in Palestine even more efficient). It allows them to shift a percentage of free users to paid plans.

So it’s lots really. And supporting Microsoft today is very similar to supporting Volkswagen during Nazi Germany’s rule.