I think we're going to be seeing more and more of this type of thing in Europe. Of course some administrations have already done it before, sometimes sucessfully, like the French gendarmerie and sometimes unsuccesfully like Munich that ended up reverting to Windows (mostly for political rather than technical reasons).

But previously the motivations were difficult to understand for many, either being about saving money on licenses with dubious returns once retraining was considered or about software freedom arguments that are difficult to explain to non geeks.

These days the US is increasingly seen as an untrustworthy partner / supplier in Europe and the digital digital sovereignty arguments are well understood, both by politicians and the general public.