The context here is removing reliance on US. EU countries are trying to decouple from US (or at least diversify if not possible to decouple) in various critical sectors where they have become dependent. Over reliance on US software is one of them. They are basically doing what China did many decades ago. Have home grown alternatives to US apps/services so as to not be in deep waters if US decides to sanction them. It is all about independence.

> why more businesses don't rely on Apple products knowing the simplicity of just buying an iMac and adding some apps to it?

Apple is a US company first and foremost and US has become unreliable. It has nothing to do with simplicity or productivity if reliability is in question. What use is a Mac if it can be subject to US sanctions resulting in App Store being shutdown for you or your entire Country and apps/services stop working overnight?